Best clipless pedals for sore feet?
All clipless pedals, including road versions, have very small contact patch. Even though road pedals are large, most of the size is just mechanism and actual contact patch is the small metal patch over the axle. The largest contact area is probably with MTB pedals that have metal frame around the clipping mechanism.

What you need is shoes with stiffer soles.

I have had flexy shoes from Mavic for both SPD and road pedals, and those were painful to ride. Stiffer shoes have been just fine with the same pedals.