Me, I like a slender blade profile that's between 2 3/4's and 3 1/4 inches long. I never used to give much thought about blade grinding methods until I handled both (flat grinds vs hollow big wheel grinds) and now I've had a lot of both and prefer the hollow grinds like I've found on Menefee's and Dowell's. They seem to cut better and are easier to sharpen as well.
Dowell examples...
Some Menefee examples...
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