The DXT Mouse by Kinesis is the absolute best mouse I've ever used. It's ambidextrous so you can switch back and forth to do wear-leveling. It's crazy comfortable. You may have to raise it up on a book or something though next to your keyboard due to the different way you hold it.

I switch back and forth between a DXT mouse and a trackball every couple days so that I'm not always doing the same motions.

I also use auto-click software so that I don't have to click the mouse. I use RSI Guard which has this feature.

https://www.amazon.com/Kinesis-Corporation-Wireless-Promotes...