Wrist for me (with wireless air integration).
I started with a console (Cobra with air integration) clipped to a retractor on my chest, but after two years I got annoyed with turning it over read it. Plus I got to thinking I should take a backup on dive vacations, in case it stopped working.
So I got a Vytec (with air integration) for my wrist. I've found it keeps me much more on top of my numbers. The air integration is important for this. The Vytec uses the same algorithm and display as my Cobra, so I'm right at home with it.
But what if the pressure transmission from tank to Vytec fails? OK, I needed to add a simple SPG as a backup. But wait! Just continue diving with the Cobrause it for backup pressure! Now I have backups galore: Cobra backing up Vytec pressure on my wrist, dual computers under water, and vacation dive insurance.