There are a few factors to think about here. Typically, to pick up the audio of a drum set, you will need a lot of mics — eight of them. So, if you are using microphone stands, that means you will have to carry around eight heavy stands with you wherever you go. On top of that, placing eight mic stands on the stage makes cable management even more difficult. Both of these problems are solved by using a mic clip instead of mic stands. That being said, mic stands will give you cleaner audio than mic clamps.