That's a fair point but Mike had his limitations too. I agree that later in his career, Mike was a pretty good defender. But he wasn't at the beginning of his career.
Mikes last 2 years he has little success beyond the arc, would get in trouble when driving and don't even get me started on free throws. The only shot I think Mike was confident in was that mid range jump shot at the elbow.
JB looks to be a better shooter and is getting better at finishing at the rim. Defense can be improved upon by understanding the game and overal hustle.
Mike was better at finishing at the rim