Answer two questions first:

(1) Do you already have shoes that you use for riding, or do you intend to buy shoes to accompany your chosen pedal?

(2) How do you envision your rides to be, typically (in groups, road only, few stops, little to no walking about; or utility, light shopping, walking about in towns)?

If you have shoes and they're not bike-specific, then start with platforms.

If you intend to buy shoes as well, then you have to decide whether you want utility on the bike, or utility off the bike. For me, my road bikes have SPD-SL road cleats. My utility bikes have SPD mountain cleats. I never ride on platforms by choice.