For me, some factors MUST be taken in consideration for any build here, in PvE - most builds here fail badly, when passing through this filter;
1 - AMMO counting; builds based primarily in Frag or / and MC.s cannot stay more than 5-10 min in a sustained fight without getting dry:
2 - Ability to fight 2 wings of NPC.s at once - 2 hard wings, with NPC in elite Condas , Python.s and a mix small / medium ships ( Vulture, DS, etc) If your build can fight 2 Condas, 2 Vulture and 2 Eagles AT ONCE without running out of ammo and without getting hull damage ( or worse, get killed) AND be able to fight again the same thing 5 minutes later, then is a GOOD build.
I can do this over 1 hour with my build in CNP.s and ReSh.
I think you cannot use a black only or withe only build, since we have a big enough variety of ships/targets, all with different strong points. I think one must use a mix of what he feels better at getting most effective results.
My build consists in a pair of huge, efficient/vented beams, 2 I Hammer.s with LR and plasma slugs, and 3 MC with corrosive - the small ones in turrets, the ventral one gimballed ;
I never run out of ammo and I find this build THE best for my taste, since is a mix of fixed / gimballed / turrets who can deal fast with anything the NPC will throw at me. Also, in a side note, I found an elite NPC pilot for my SLF worth his cut, when you "school" him from novice up to elite, once he can do hilarious amounts of damage against other NPC.s...
The Beam can fire NON-STOP, same go for the rails, never overheat, and you only can screw-up if you make dumb mistakes...