I've heard of clipless on one and platform on the other... BUT, would it be possible to run power grips on one side and clipless on the other? I mean a single pedal that is clipless and toe-clip compatible. It seems like a logical thing to do, just swap them out when the need comes.
'''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
The only problem I see is that the Power Grips" would probably drag on the ground when you are using the clipless side of the pedal. Toe clip and strap pedals usually do drag the clips when upside down and these might too.