I pretty much played in all roles.
INTs are fun, but since they can't jump they are slow to get from system to system.
FIG's have less firepower than int's, but they have shields and can ripcord, which makes them very useful for quick responses.
Bombers are also fun, atlough I prefer to be a gunner during such raids.
Stealth Bombers are the bomb. The planing, the setup of several SB's as they slip into a enemy system and hide, then wait. It's like a WW2 sub move, you wait, hide behind asteroids while your energy re-charges and avoid scouts dropping pulse probes. Wait for the setup (all SB's appox 6000m from the target), a diversion, then the attack signal. Move in, decloak and hope you can let the missiles fly before your paper-thin hull is gone.
Scouts are almost the most fun. You can actually do 3 things in them.
1. Nanny - following and repairing any crtitical ships - capships, miners, bombers
2. Scout - exploring system, placing sat probes all over hte places. Or sneaking and placing a rip boy strategicly
3. interferance - load up on proximity mines, use hte comotion during an attack to fly in front of the enemy base exit door and start dropping! Nothing beats a minefiled right at the base hangar or Aleph (wormhole)exit.