General cencus.
1 cheap folding pedals might be ok for casual riders.
2 some better pedals wear better ie mks fp 6/7 brompton
3 use folding , but treat as consumerables and replace yearly
4 use spd as small anyway.
5 opt for detachables mks or wellgo. This also means can swop for spd sytle or standard pedals depending on footwear.

Quick note. mks cleats are compactable with shimano spd but spd cleats don't work with mks. So get mks and it will work with your spd pedals.