I think it depends on the amount of work you are planning on doing and how fast you want to do it. I think for the hobbyist a ¼ motor would be fine. For me, I do not work on a lot of razors and feel much more at ease with a small motor and small wheels, they take a lot longer to work than a big wheels and big motors but are a good compromise for me. Me, I am slow and steady.

Charlie