I use ZSNES to play all the kickass RPGs that never made it to PAL release.
What kind of mind decides not to release FFVI, Chrono Trigger or Super Mario RPG, and then gives us FF:Mystic Quest?
The only decent thing we got that the US didn't was Terranigma, so any emulator users should check that out, and see how it feels. (Enix actually manage to better Zelda with this game, that's pretty impressive).
And of course there's the translated Seiken Densetu 3 (Secret of Mana 2), which I'm playing on co-op with my room mates.
As for games that are better to play on emu, save state does mean you don't have to finish a game in one sitting if it doesn't have a save system *ahem*StarFox*ahem*, and the frameskip/fast forward means you don't have to sit through long boring cut-scenes if you don't want to (also the Opera scene in FFVI is just funny played at high speed).