Though MP sometimes was sloppy with his double bass work live, i also think that MM plays "too soft" on the double bass and it does sound a bit weak compared to MP. I've noticed this both live and in some live footage.
Also, i don't like MM's hihat sound, its not so defined and it never sounds completely closed. It may have to do with the brand or type of hihats he uses, but its not as tight as MP's.
But i think we can all agree that MM is much more advanced than MP technically, some of his polyrythmic playing is absolutely sick and probably MP would be unable to come up with that kind of stuff.
So it's a mixed bag for me so far, but i really like MM's use of dynamics and the fact that he plays closely to the original tempo of the songs live.