So I put homebrew only....but that's not actually true either. How about another selection... Ala Carte? I like things to be setting focused, just to add that bit of grit to the picture, so battle-mages wielding anime weapons and doing wire-fu doesn't quite mesh with a historical western campaign. Likewise, ninjas in black PJs roaming the surface of Mars doesn't work either, you know, unless it does. So honestly, it really does depend on the specific campaign style/type I'm running at any given moment. So all the answers could be correct or none of them.