I prefer acrylic. Have you looked at the offerings from Exotic Blanks? They have 1 1/2" diameter blanks that are 2 1/4" long and make beautiful handles.
If you have access to Stainless, then go ahead and use it, if nothing else as a learning experience.
I'm guessing that you work in a machine shop and have access to remnant materials. Use whatever you have available and then consider the more exotic stuff.