I still argue that if you want the true tone of the drum to be there, the membrane sides must be the same, all things being equal. Which is why whatever I have on top goes on the bottom. Right now I have Vintage Emperors top and bottom and those drums sound great. I've also heard great drums with thinners resos too, so you can really do whatever you want. For me, the purchasing part is easier, and being a little old school, I can always just flip the drum over at a gig if I break the batter and still get through the night with something that feels the same, even though it doesn't sound the same.