Also, just checking - was Jason Rullo even nominated? I managed to miss him completely if he was, but I find it hard to believe that at least one Beaurbocker (or is it Knickergard?) hasn't put him there.
But out of these two, it's really easy and simple - and I don't even like Portnoy the most, but he certainly has that "passion for groove", you know, that charm that makes you jump out of your chair and air-drum the **** out of the song. I can't even analyze what it is exactly (certain imprecision, though characteristic and humanizing, possibly?), but it's under my internal tag "Bro, do you even clave?" And you don't have to play Latin rhythms or anything, it's just the conceivability that you could. That's what makes me a fan of Portnoy, Nicko, Bruford, the Allman drummers, Copeland, Gingy Baky, Mike Shrieve (duh) and even Phil Collins in his prime and lesser fan of Minnemann, Mangini (though I like them for other reasons), White (Alan, not Lenny), Liebezeit and yes, Peart. Sure, Minnemann and Mangini turn "technical" drumming to such levels it becomes absurd and therefore fun again for me (somewhat), but none would really make me want to pick a drumset, were I to choose an instrument to play.