I used to try and cater to each individuals needs by putting together edge angles that they preferred. I no longer do that, instead I sharpen straight primary bevels of 25 degrees. Now this is for general sharpening when I’m doing a batch of plane irons for instance. If a client sends me a new set of mortise chisels or a set of paring chisels I will set up and do different primary bevels. I will however leave the secondary beveling and micro beveling to the client.
Professional woodworkers for the most part sharpen by hand as they work as over time they’ve learned to ‘teach’ their hands to hold a certain angle all the way through the sharpening and honing process. Are their angles right on 20 or 25 or 30 degrees? Probably not…what they do have are two angles meeting at a point and THAT is the key to a great edge!
All for now, good luck, play safe and God Bless!
Yours in Shavings,