I had good luck playing five Green Squadrons, all with Predator, in a game last night. The advantages were many, and I'm starting to rethink the conventional wisdom of PTL being almost an auto-include on As.
The biggest benefit is that Predator isn't an action, thus not susceptible to blocking/stress/k-turns; anything that can stop actions. This came into play very often last night, and freed me up to re-think how I maneuver with As. Knowing I'd still have re-rolls, I tried some things I may not have in the past (being worried about bumping/being blocked), since I'd still make the most out of my two puny attacks.
Predator functions almost like PTL anyway, since not having to target lock means using your action for maneuvering or focus. The nice thing is that you're not stressed after your actions, a la PTL, giving you more maneuver next turn. This takes better advantage of the A's greatest advantage -- its fantastic dial.
PTL can be great for turtling, i.e. focus/evading, or TL/focus, or, especially (of course), Interceptors, with their barrel rolling ability. I think maneuvering/attack is more important than defense, though, so the turtling aspect is minimal, IMO. Besides, getting out of arc with maneuver is preferable to being able to withstand attacks. Predator seems to leave you with more next-turn options by avoiding stress.
So on the whole, I'm starting to believe that, specifically for A-Wings, Predator may be the superior choice in most cases. It sure was for me last night. Only one game, of course, so I'll need to do it more often; and other pilots (Tycho or Jake, perhaps) may do better with PTL. But for my particular list, it was quite effective.