That's a pretty fair and accurate assessment of both mice. I don't think there are any better mice for MMOs on the market than these two. If you can find a PC store or Best Buy that has these on display, just try your hand out on them. The G600 may just be too big for your hand, but you never know until you try.
My wife uses a Naga b/c I bought that one first and it fits her hand better. Now I can't stand it lol.