Hi Ethan,
Just a few years ago I had the very same question. I tried every possible geometry and width. If I were to start now I would only use three variables to decide on what razor to start with:
- Must be honed by a pro
- Its width should directly correlate with the distance between my nose and the upper lip (in my case 5/8 works wonderfully)
- Respectable manufacturer (does not have to be new)
Hope it helps,
AG