I use platform (with toe clips) on my folding bike, only because I can remove the pedal without tools when I fold it up.
I have a couple bikes that take SPD cleats on both sides, but those are my go faster kinds of bikes, not general use bikes.
Touring I use either the M324 or A530 pedals. The M324 give me better grip when I am wearing my hiking shoes, but the A530 are lighter. Thus, the bikes I might use on gravel get the M324 because sometimes I want to wear hiking shoes, but for lighter weight touring I use the A530 pedal.
A few years ago I compared the A530 and M324 if you are interested, at this link:
Comparing Shimano M324 and A530 Pedals