I'm just getting into this and was wondering what, if any, are the benefits to some of the other emulators out there as opposed to MAME. Raine, Daphne, etc. I don't know if these are just different emus that do the same thing or if they are written for specific things.
Ok, where do I start with this - in some cases these emulators will do different things, in some case, they run better on slower computers, in some cases, they just were developed separately.
Daphne is for laser disc games - Space Ace and Dragon's Lair, but also Cobra Command, and I think Firefox.
MAME is for arcade games - but there are also Nebula, Kawaks, RAINE, System16, Final Burn, Modeler, Vivo Nonno, and Zinc. In general these play the same types of games, however, some of them might play a few games that aren't in MAME, and some are better on slower systems. Historical note: there used to be a lot more Emulators (stand alone emu's for Space Invaders, Shark for Flying Shark, Tiger-Heli, etc.), but most of these have been swallowed up by MAME. One thing worth noting is that MAME is not really about playing the games, but about re-creating how the original game worked (there is a subtle difference). What this means in reality is that MAME does not use shortcuts (graphic calls, mainly) that would speed up emulation at the expense of accuracy, so it tends to be slower and want faster hardware than other emu's.
There are also emulators for the console systems - I am just starting to investigate this myself -
MESS - the MAME of console emulation.
Z26 - for the ATARI 2600
Gens - for the sega Genesis
Nesticle or VirtualNES for the original Nintendo (Famicon).
ZSNES for the Super Nintendo
There are also PlayStation, Gameboy, Gameboy Color, and other emulators, but I am not familiar with them.
And for the Nintendo 64, there is Project 64, 1964, Daedalus, Uhle 2064, and Nemu.
One neat trick I've found lately is that most of the arcade games that are terribly slow in MAME had ports for the N64. So while California Speed will need a 4 Ghz P4 in MAME (in a couple of versions, when they get it loaded, I can play it on a Duron 850 in Project 64. Same goes for Hydro Thunder, Cruisin' series, Blitz series, NBA Jam, NBA Max hangtime, SF Rush, etc.