Out of the two you mentioned, there is a big question to be answered. Does weight bother you? If you like a lighter mouse, then the rival is your pick. It's not all too much heavier than your Savu, but is a REALLY different shape. The G502 does have a great sensor, but you're looking at a mouse that weights 50% more than your current unit. It is really hard for me to deal with the weight in game. I am using the FK1 in a Zowie AM-GS body, which is lighter than the already light FK1, and it's perfect for me. I can go a touch heavier (g402), but that's about as far as I go without having to pay attention to my mouse hand.