Best mouse is all about the games you play. My Logitech g600 was a blessing i n guikdwars 2 that required a gigantic amount of buttons to use for all the skills. It was nice to be able to map them all to the mouse and use the keyboard for movement.
Also in wizard wars magicka... Its kind d of unfair because you can macro all the spell combos onto the mouse button s with 1 press.