When working the muscles of the body, a warm-up period should begin, so that the muscles are activated, then stretching should be performed so that the muscles relax and flex so that weight lifting can be done properly, since This will help us to have a better performance and, in turn, prevent musculoskeletal injuries due to body cooling, and finally stretch again so that the muscles can recover more quickly from their effort.
In my opinion black is better because it goes with every color of clothes you have.If you spill something on it you can't really tell either.But every one has there opinions.:)