Stock pedals are on the bike so you can ride it away from the shop. Unless you are buying a better quality bike that may have a clipless pedal fitted- they are always platform pedals supplied and the quality is not that high. If you do want a platform pedal for your normal use then look for a pedal that has bearings fitted and an adjustment nut that means that you can not only adjust any play that comes in- you can regrease the bearings or even replace the bearings. This type of pedal is more robust and mostly made of metal with a large platform instead of being made from resin.