I used a trackball at work for a short time & just didn't work well for me.
laptop touch pads are too touchy for me
Tried the ergo mice , various brand name mice ,and they just didn't fit well for me, I always come back to the mid size plain Logitech mouse.

Same way w/ keyboards for me , I have to go to the store & actually put hands on. The spacing of the keys, pressure needed, how far they need depressed, LOL maybe I'm just picky.. But the huge ergo or split keyboards didn't work for me either.