in my opinion commentary is good as you keep your audience engaged whereas with music sometimes i get bored watching videos because theres nothing apart from the recording keeping me entertained and i may as well listen to it with no sound if that is the case.
personally i would still have commentary just be enthusiastic a great minecraft example is Mumbo Jumbo his commentary is very enthusiastic sounding and he sounds like he is having fun playing which is important otherwise you can sound like you dont care about what your doing.