Ravok -
There are so many SFC3 visions out there - it's hard to say what's best as each is unique. I had one, still on sfc3files, that I'm going to update. My goal for SFC3 is to have a heck of a lot of fun on GSA or even single player.
Nannerslug's Generations At War, I can say from having played it, has quite the variety in it. He includes OP races, not just TNG. My focus is enhanced TNG, like the Nemesis Sovereign model from Bridge Commander firing from more arcs than you can count.. mucho fun.