Emulator questions

Hey there, ive been away from emulation and homebrew for a while but i just got back and made my psp phat run on 4.01 m33-2 and i have some psx and psp games up and running, but i dont know what SNES/GENESIS etc emulators are the best, so if someone could tell me which ones are the most optimised that would be great, thanks.

For Genesis, use Picodrive. For SNES, I recommend Snes9x tyl 0.4.2 me, but make sure you have access to the 1.50 kernel. Picodrive also can use Sega CD isos.

If you want to play multi player games with a friend via ad hoc use dgen 1.7 for the genesis.