Well, we got one clip here for illustrative purposes, but I guess off the top, I wouldn't think that their vocal stylings in Plato would have been at all objectionable to either, given their real world efforts in that realm ( I gather Nimoy rather more than Shatner). I'm sure there have been any number of threads regarding that subject over time, but I don't think I've ever run across any of them in my relative short tenure here. Anyone willing to point the way, as I would find commentary about their relative abilities, material choices, and critical reception quite interesting to read about amongst forum members, as opposed to just getting Wikipedia's take.