I have looked at the market comparison chart, but I didn't know if there is a "best" market that has gained dominance since Silk Road's seizure last fall.
Things that I think would make a market "best" would be site layout/ease of site navigation, wide variety of listings, use of the escrow system, low fees, etc.
Agora, Evo, Cloud 9 and TMG are te markets I use. Too hard to say which is best. I like them all!
-LadyLove