I started L4 missions with a Raven (well, a Drake, but that was no good, so went back to L3s till I could Raven properly). Then upgraded to Raven Navy, and now use Nightmare.
I’d say the Nightmare is more fun than a Raven, because there’s no waiting time for the missiles to arrive everything within range dies real fast, and there’s little use for drones as you can kill everything as it closes in on you. Using Tachs so pretty much everything is in range 
The fit I use is listed here
May consider a Mach (travel time in a BS isn’t fun) or Golem (lazy mode) if I ever get back into L4s.
Regards,
Cypr3ss.