Interestin discussion, I think. Though I think the term "the best" does not work in a conversation about musicians. How would you judge? The one who plays the most notes in the shortest time? Ahhhh...let me think about that for a minute! I guess that's not it! Well...why not say "the one I like most, or the one whose play means the most to me". Well than...
Of course I have to keep the flag high for someone who was not mentioned here before, when I am correct, this would be Simon Phillips!
Comparing Jason and Mike Portnoy is totally boring, as Jason has the way better personality and I know he is the more versatile drummer. So, I did it as well, though I think it is boring. Hahaha! ;-)
Ciao for now!
Andre