Title pretty much says it all. Are there any unofficial guidelines or rules of thumb as to which defensive tokens are best negated by accuracy rolls? If I've only got one accuracy roll, should Brace be negated before evade, or vice versa?

I know a lot of this is situational, but I was wondering if there were any good general rules to follow when all things are equal.

Depends on how much damage is in the roll in question and what your goals you expect to achieve with that damage are. In general, higher damage rolls would favor the brace being the target so they have no choice but to accept all of it. There may be other cases however where forcing the damage onto the target location (Redirect priority) are more critical.

I generally go for whatever can get the most damage through. Unless you can stop someone from using a redirect and generate enough damage that they are destroyed I almost always target the brace first if a ship has it. Getting 6 damage braced down to 3 is awful even if the 6 gets spread around the shields. Redirects become useless fast if you're plowing through their brace.

In a long range fight evade may be more important, but i feel that is more for small damage rolls where negating one dice could stop all damage.

It depends on your situation a lot. If you throw 3 red dice at long range and get 2 hits and an accuracy you can either target a Brace or an Evade, both will reduce the damage equally. Generally, you're going to want them to spend their Brace, rather than their Evade (generally, but not always.) So you'd want to block their Evade, forcing them to either take the damage, or spend their Brace.

usuaslly brace. or sometimes redirect. you wanna try and get into hull, so just see which one reduces the most damage, and go with that.

Sometimes evade for low amounts of dice for small ships.

It's too situational, you can't have guidelines on which tokens to accuracy except for the very general rule that you should accuracy the ones that can stop the most effective damage. But even this has exceptions: when ships have the TRC upgrade I tend to not target evade in the hope that they will spend it, reducing their firepower during their activation.

Look at how much damage will be prevented, and how your opponent using that token now will impact future shots.

If an evade will remove a double hit at long range, vs a brace halving 4 or 5 points of damage, it doesn't matter in that moment which token is spent / prevented. But there can be more to the story - has this ship not been activated yet and has Turbolaser Reroute Circuit? Is there another, bigger shot from another ship that still needs to be taken?

When it matters, hit brace. The only time you don't want to hit brace is when you're forcing your opponent into discarding it.

you might want to use the Accuracy on an evade if you want your critical effect to go off too. The evade can be used to eliminate or reroll a critical which you may have need to get that Overload Pulse off or Assault Proton Torpedos etc.

I would give precedence to any of the defenses that would reduce damage, so Brace and Evade. However, you also need to consider what is the game state of those tokens, upgrades on the ship and the range of the shot.

You will find that if a ship has 2 Evades cancelling one is a little pointless, if one has been previously spent then cancel the unspent token.

You will also find that cancelling a Redirect when your opponent has no shields, or a brace when you only have 1 damage quite pointless.

In general the other comments are all good, first priority is to ensure you hit with the damage rolled, then try and give your opponent hard choices.

It really depends on what I am trying to do. If I want to put them in a position to burn that brace on their own then I will leave it alone. If I am at long range with a few dice then the evade goes, If I am at medium it might not go. It really is a judgement call and the best way to learn is to put yourself in those situations.

I actually negated a 'contain' token last weekend, by rolling a blue accuracy and a black crit with a B-wing.

Default Brace. Any other answer depends on your situation

If with a lot of damage brace first (unless you have an upgrade that reduces the effectivness of brace)

If at long range and low damage then evade tokens. IF you can get the to exhaust brace to cancel 1 or 2 hits all the better to force a discard.

If against an unshielded section and crits are up redirect unless the defender has contain than hit that next. Otherwise just always target brace.

Too situational to have a guide, IMO

for example as Lyr already said, it depends on what you are trying to do

Sometimes deciding what to block and what not to block is highly dependent on what you expect your opponent to do next and/or what you have planned to do next.

You always want to leave your opponent with bad choices and sometimes the action that does not necessarily result in the biggest amount of damage on this attack will result in the biggest amount of damage in the round.

I usually leave my biggest shots for last because my opponent knows the big shot is coming and often they will eat a lot of damage to "save up" defenses for the big shot, and then I might use he big shot on another target lol. It is all situational and that is where the game actually lies.

... I may be attempting to write a primer on this. Too situational to have charts, you'd have a LOT of charts. But not so situational that you can't have a decision making process in place.

A basic decision framework, with a hearty "in most cases" disclaimer, might be worth the time...

But the trouble is, how basic do you make it, or do you have amendments that include things like Turbolaser Upgrades, since they tend to directly screw with choices of tokens for your opponent?

This is a little nuanced but if the opponent has two of the same token and one has already been exhausted make sure you target the green one specifically. Don't just say generically "redirect". While that doesn't stop him from redirecting now he has to chose between discarding a token or eating the damage on the targeted zone.

specific commanders can also affect your choices. Mon mothma may make you cancel an evade instead. If you have dodonna, maybe a redirect or contain.

Whichever one allows you to push more damage.

I'm going to take a slightly different approach. First to consider would be how many shots am I going to get on this ship/hull zone this turn. Often if shooting with a small or medium based ship if you will get a shot later in the turn with heavier firepower you may not want to pin down the Brace hoping that you can sucker an opponent into using it now so if he uses it later against a bigger attack he'll lose it permanently. What I'm saying is consider all shot together and not just individually.

I'm going to take a slightly different approach. First to consider would be how many shots am I going to get on this ship/hull zone this turn. Often if shooting with a small or medium based ship if you will get a shot later in the turn with heavier firepower you may not want to pin down the Brace hoping that you can sucker an opponent into using it now so if he uses it later against a bigger attack he'll lose it permanently. What I'm saying is consider all shot together and not just individually.

Anytime my opponent braces early in a round for anything less than 5 damage I cheer inside.