far as I know it goes like this
mark of the wolves = not arcade perfect but better than the dreamcast version
last blade 1 = good
last blade 2 = slowdown
art of fighting anthology = all great
fatal fury battle archive 1 = all great
fatal fury battle archive 2 = all great
world heroes anthology/gorgeous = all great
samurai shodown anthology USA = shit
samurai shodown anthology JPN = good (not positive on this)
kof orochi collection JPN = good
kof orochi collection USA = shit, KOF 98 added but overall emulation feels way off to me
fuun super combo = good i think but I don't have alot of neo experience in these games
I think all but motw are emulated, if that means anything. fatal fury battle archives 2 and later have training modes. They all have the awesome option of using the neogeo cd arranged soundtracks

making them worth owning even if you have the mvs/aes versions. I left out games I donno shit about.