I use Ilford HP5+ for 5x7, 120, and 35mm. The odd roll of Pan-F+ 120 gets tossed into the mix when I shoot pinhole.
The simpler the better.
For color I use whatever C41 I can lay my hands on while I practice at developing that film at home. When I get around to printing color neg film on RA4 I will probably settle on a single emulsion.