There will always be the rims vs non-rims debate. Truth be told, yes, I can tell that my Rogers 8x12 rack tom is choked when compared to having it on a stand. Doesn't bother me a bit! Most of the finest drum sounds of the 60's and 70's came from toms with non-rims mounts. Actually, the same holds true for all kits that came standard with tom mounts attached directly to the shells. Funny, but did drummers really notice the difference back then?
Of course they did. That is what drives innovation and that is why isolation mounts were developed. I personnaly find it frustrating to have tuned a tom to the point where it sings and then put it on a mount that chokes it. To each his own but I prefer hearing all a drum can be.
We also used to think a 4:3 CRT SD TV had a fantastic picture.
Idrum4fun's suggestion of final tuning on the mount is practical, however, it just shed's additional light on the issue. The drum sounded great on it's own but now we have to 'fix' it now that it is mounted. Hmmm...