it's not a stupid question. it's only stupid if you are unsure but pretend that you have the answers. anyway I see there are already a few summarized answers in point form, given by the kind forumers above.

anyway, to visualize the differences in a simple way, is imagine yourself, wearing running shoes and clothes, and running down the track. and next imagine yourself, wearing slacks, shirt, tie and a coat, carrying a heavy briefcase, running down the same track. which version of you will you think runs faster, and easier to turn corners?