Very personal decision. Most like different mice because we all have different size hands.
I settled into Logitech G700. About 7 years ago I decided I liked that mouse and purchased four of them. One for work and two for home and one in the car as back up wherever I am.
The main feature I like about it is the wide and flap-topped wheel that can also be used for side to side input.
We've used the Logitech MX1000 and now the newer MX800 [combo] units for many years, as have good precision, comfortable size & shape, cordless, and have numerous programable buttons......I also have a 3D Connexion Space Pilot for while I'm docked at the office.
Design Manager Streetscape Ltd
Solid Edge 2019 [MP1] Classic [x3 seats]
Windows 10 - Quadro P2000
I've been using a Logitech Cordless Optical Trackman for the last ten years. It was an arm saver from the standard type mice. Only downside is they have stopped making it, so I purchased a few to last me and now down to last one. I have no idea what I will chose to use when it needs replacing (when the left mouse button packs up from the endless mouse clicks we have to do)...
I have a Cad Mouse from 3DConnection, in the closet...
I suffer RSI, and this mouse doesn't help.
Therefor I use a wacom tablet. At the office a very old bamboo fun and at home a intuos 3.
I also use a classic mouse with my left hand and a spacepilot pro to navigate.
A perfect setting for me. There is more for inpunt than a mouse. A 3D mouse is for me a must.
And, for a regular mouse, I have used the Logitech trackball for the past 15+ years. I can't stand having to pick up the mouse, over and over, so I like just rolling my thumb to move the pointer.
I'm using a Logitech cordless mouse. For me, a basic 3 button/wheel mouse works fine. More important to me is my 3D Connextion Space Mouse Pro. Being able to manipulate views with it is second nature.
Unfortunately, I can't say the same about the 3D Connexion CAD mouse. I used one while taking the certification test at SEU2015 and by the time I was done, my hand was killing me.