"performance" in rollers is a tough one. Lager diameter drums have less resistance than the smaller drums. The resistance comes from the deformation of the tire and the friction of rpm (smaller turns more).

Then there is the quality of the frame and roundness. A sturdy frame is always better - except when it comes to cost and transport. A rounder roller is better. Most bearings are good enough.

So if one was going to do a roller race (as was popular in the 80s) get the biggest roundest drums, ceramic bearings, most elastic belt (don't know which that would be) and a supple, very nicely seated clincher at high pressure on double discs.