CORSET/WAIST CINCHER HELP PLEASE!?

fitness-fits-me:

OK i was wondering, which corset of these two would be the best overall and the best for working out in?! I know they’re good quality, I buy from that website all the time, just want to know, if you’re knowledgeable on corsets/waist cinchers, which is the best. thank you! :3 

Second one