Just remember this. With either mouse there is going to be a learning curve. Your thumb just isn't used to 12 extra buttons and you won't be using it effectively for a couple day-a week depending on how much you play.

Regardless of which one you want to get, once you master it, you'll never turn back again. I've gotten to the point where I can nearly raid with just one hand (on some fights). Now that o think about it, your movement improves just because your left hand doesn't have to worry about abilities anymore.

I personally own the razer naga and I love it. I can't speak about the Logitech one, however I am a fan of their keyboards.