I've read a few of the Wiz vs. Caanoo threads, but I'm still undecided.
What I like about the Wiz: good (or great) GBC, NES, Genesis, NeoGeo, FinalBurnAlpha, TG16 emulation; nice screen, decent build-quality.
What I don't like: the ABXY buttons; the d-pad is better than the GP2X stick, but...