Personnaly, I always chose my fighters depending on the mission. For example: Patrol i'd take medium to heavy fighter, for an escort i'd take a medium. I hate bombers, even in Freespace 2 i freak when i have to use Bombers, In one mission when i have to destroy a bunch of Shivan Corvettes, cruisers and a Ravana Class Destroyer i take something like a Hercules Mk2 or a Perseus and start blasting my burners and let loose the dogs of war with my primaries and secondaries. I've even got a Hecate kill with that tactic....
Bombers just suck, by the time your torps lock and your close enough that the turrets don't shoot down you warheads you're already half-dead.