I feel like I've read a lot lately about the increasing preponderance of BBBBZ in Store Championships both as a counter to high health turrets and to have too many hit points to chew through to claim all the points in timed rounds. It's an interesting and effective list, certainly, but I wonder about the slightly less efficient XXXXZ might be a viable option also.
Strengths of BBBBZ over XXXXZ:
12 more hit points: This especially matters against high dice output guns like HLCs and Phantoms that are not defended well by the X-wing's AGI 2.
Shifty movement options: You get access to the 1-turn, even if red, and you get the barrel roll
Strengths of XXXXZ over BBBBZ:
AGI2: This matters the most against massed low output guns like Zs or TIE Fighters.
Fast movement options: The 4-straight, 3-turn, white 3-bank, and longer K-turn allow greater displacement from your dial.
4 more points: BBBBZ is 100, XXXXZ is 96. This is the real kicker, here. What can you get for 4 points that might matter?
One of the X's is Biggs (4 points): It's Biggs in the back rank. What can you say?
R3-A2 (stressbot) (2 points): One of your X's can start spewing stress each turn.
Flechette Torpedoes (2 points): Like R3-A2, but not as good.
One of the X's is Tarn Mison (2 points): You get an X-wing that's a bit better than a Rookie.
Ion Pulse Missile (3 points): Make that big ship predictable for a turn. It also gives your opponent a reason to shoot at the little Z-95, which is also nice, there's a point leftover for Munitions Failsafe, which might be useful.
Upgrade the Z-95 to a Refit Prototype Pilot (3 points): The A-wing is a better blocker, and has a few more movement options than the Z, and probably also gets more Range 1 shots.
Initiative Bid: This is probably most important against another Rebel Swarm list, unless you really just love making sure you get the big asteroid.
Other good astromechs I'm not thinking of?
To me, Biggs or R3-A2 are the most compelling upgrades you might take in an XXXXZ list. R3A2 gives you some better options against arc dodgers (probably your biggest threat), it also is great to let you out-joust other jousters because it can prevent a K-turn from one of their ships. It also sort of ends up acting as Biggs on its own, but saves 2 points. I think R3A2 with Tarn is sort of a Biggs that hits a bit harder than Biggs and does some mean stress stuff, but isn't the sure thing that Biggs is.
An Ion Pulse Z with Munitions Failsafe or an XXXXA list with a 1 point Initiative bid also seem like reasonably good options.
Any thoughts?