Personally the nylon sport loops are my preference for workouts. They’ll get wet from sweat and will need to be washed often. I have about 40 of them (mostly cheap knockoffs from AliExpress - a couple bucks each) so I always keep a couple extra clean ones in my gym bag to switch out after a workout. They’re lightweight, secure, and very very comfortable. Also very easy to adjust as the size of your wrist changes as you get hotter working out.