The features I'm looking for are something compact, reliable, would like USB connectivity and would like air integration but not essential. Thats pretty much it.
The guys at the shop I spoke to all seam to like oceanic (particularly the recommended the oceanic OCi) but after I'd read about their reliability and build quality problems I was a little worried about that.
Compact costs $... AI cost $ together costs $$ and limits options.
Many dive professionals (instructors) I know use watch sized computers for two reasons, 1 - they dive a lot so only use the one device for in and out of water and 2 - it creates a talking point out-side of diving and introduced diving conversation to a group and can lead to business...