If you never have to climb, platform all the way for a commute.. its just so much safer and convenient when you have to detatch your foot from the pedal. I prefer clipping in while commuting just because of all the hills around me though, they're endless here and like mentioned already, night and day between clipless and platform while climbing.
Ive got some pretty nice platforms if you want to trade? I went clipless and don't plan on going platform again unless I get another bike (if even) and I've wanted to try out speedplays on a budget for a long time.
Very grippy and stylish on a road bike, about as good as platform gets as far I'm concerned.