Go with this list, then pick the one that suites your hand ergonomically. A mice shape that suites one person may not suite you, but the core function that's measurable will be the same for everyone. Except for the Razer products because of quality issues... I had 2 razer products that just couldn't even handle stress from couple months of regular use. Very fragile and poor quality just to give you heads up (may have fixed it but I won't risk it).