The best and only version of MAME that anyone should use! Beyond that, what Talking Octopus said:
Short Answer: NoName includes features and hacks from many mame derivatives. It basically includes the default MAME and almost everything that other people have added to it.
Little known (and much appreciated) features:
Pong and Monaco GP
Disable Bad Dumps and Game Problems warning screens (SirP)
Artwork Fill Edges (SirP)
Skip Startup Frames (SmoothMAME)
Custom Refresh Rate (SmoothMAME)
Mame Analog Plus (Urebel)
DECO Cassette Turbo Load (M.A.S.H)
Misfit MAME games (??)
Coming soon -
Underclock CPU after a time delay
Turbo startup frames (hopefully)