fNES: The first one by Rlyeh, so so in goodness, no sound (I think) - or at least, none to speak of, not sure about save (prolly not), and not all that fast on many games. Development on it has been postponed until the next ver of whatever its being ported from comes out.
Infones: Personal favourite, sometimes faster than fNES and with slightly more recognisable sound. It *does* save, which is nice, but nothing from the dev'r since the last release around X-mas.
Both emus have problems with some games' graphical bits (e.g. Earthbound, Kirby), but many are playable. Which is nice.