For a utility/hunter, I prefer a blade about 4 1/2" and a handle of about the same length. For a camp knife I like a blade about 7" and a handle of 4 1/2" to 5". Bowies I like with a blade 10" or more and a handle that is 5" to 6". The choppers that I have found to work the best have blades between 10" and 12" and handles about 5". With the handles I have found the way they are shaped to be more important than what size they are, as long as they are long enough.