I found a list to test both Bomber characters and the most damaging Defender there is:
97 points
PILOTS
Colonel Vessery (37)
TIE Defender (35), Tractor beam (1), Veteran Instincts (1), TIE/D (0), Twin Ion Engine Mk. II (1)
Tomax Bren (32)
TIE Bomber (24), Crack Shot (1), Extra Munitions (2), Homing Missiles (5), Long Range Scanners (0)
"Deathfire" (28)
TIE Bomber (17), Extra Munitions (2), Homing Missiles (5), Conner Net (4), Long Range Scanners (0)
Not top tier by any means, but I get to try out both characters and see how good they can be. Vessery gives the list enough of a backbone that it won't immediatly fall apart.
I'd double down on offense by going for Marksmanship on Vessery. They're already going for Tomax first, might as well get focus target lock for both attacks. Since he fires after Tomax and his own tractor beam, Marksmanship has a higher chance of pushing a crit through.