Trigger Shifter
 

I need to replace the front shifter from Sram grip max to Sram trigger. The derailer is a Shimano C201, with 3 rings. I prefer the Sram trigger over Shimano due to a disability. Will any model Sram work? Does the derailer "ratio" have a significance for the front shifter?

Generally, any SRAM front trigger should work with a Shimano FD.
Rear Shimano derailleurs require 'named' SRAM shifters, as opposed to 'numbered'.

As stated above, the front derailleur will work with just about any trigger. If you want to get a matching set, SRAM Rocket and Attack trigger shifters work with Shimano rear derailleurs.