Which is the most ergonomic input device ?

[Commander]

Some years back excessive use of the mouse [that is my surmise] started affecting my handwriting and it was not steady at all.

 

I avoided use of mouse and now I use a Wireless Keyboard [K400 by Logitech I think] from 2013 and it is much better.

 

What is the best input device ergonomic and Healthy ?

[Acme]

I like the Logitech wireless Trackball M570 for the ergonomics. I also hate the Logitech wireless Trackball M570 for its poor durability. I'm on my 4th one in 3 years. The buttons stop working. !!!$%!!@@@%!## This time I paid $8 for a 2 year extended warranty that will replace it no matter what. Take that Logitec!

[Commander]

I like the Logitech wireless Trackball M570 for the ergonomics. I also hate the Logitech wireless Trackball M570 for its poor durability. I'm on my 4th one in 3 years. The buttons stop working. !!!$%!!@@@%!## This time I paid $8 for a 2 year extended warranty that will replace it no matter what. Take that Logitec!

 

Thank you Acme