It seems, the X-Wing is solid as long as its only receiving 2 attack dice worth of fire. As soon as you start ratcheting up the incoming fire to 3 dice+, the X-Wing seems fairly frail and ends up being the weak part of a list. I'll use my store championship from last weekend as an example - we had 28 players and I ran the following list:
Garvin
Rookie
Green Squadron, PtL, Concussion Missile
Green Squadron, PtL, Homing Missile
I went 2-2. Round 1 and Round 2 I managed full victories, 1 vs a double interceptor, double advanced list, and 1 vs a 7 ship imperial swarm. In both games, the A-Wings really pulled the weight - The two A-Wings accounted for most of both advanceds and an interceptor in the first game, and 6 tie fighters in the second match. Both X-Wings died vs the swarm, but just had their shields stripped in round 1.
Round 3 I came up against BIggs / Dagger + Advanded Sensors / Dagger + Advanded Sensors / Rookie and I played like a chump early. Again, both X-Wings went down to a trivial amount of fire - the Rookie dropped to a Pair of B-Wing shots, and Gavin didn't do much better. With just the A-Wings, 2 vs 4, I managed to kill his Rookie and Biggs, but couldn't manage the 2 B-Wings. Round 4, with the winner going to the finals, was vs a Han and Chewie double falcon list. Must like the previous game, the A-Wings started off strong dealing excellent damage to Chewie, and the rookie dropping dead to the first volley from Han and Chewie. I managed to finish off chewie at the cost of Garivn, and it was Han vs both A-Wings. I knocked out Hans shields and did, I believe, 3 points of damage, but misplayed toward the end and ended up with Han behind my last a-Wing and I couldn't gracefully recover from it.
Anyone else experience X-Wings being a general poor choice vs rebels? If so,are B-Wings your go-to replacement, or is it better just to bump up to the much more durable falcon?