I'd say it just depends on what you like to do with the data after the ride.

I waste enough time on the computer already without mulling over GPS data (or speed, HR, cadence, power output, yadda yadda). My commuter bike, then, has no computer; neither does my MTB. I've got a Shimano Flight Deck on my road bike, though. I got it because the shop was liquidating everything (they couldn't sell it over the four years I saw it in their stock), and I still use it for the gear display and because I can put the cadence number in the biggest spot.

The only feature I might want to add is HR, but I do so much exercise off-bike that it's pretty pointless to have a bike-only HRM.