Well, I think a round hammer would mean more to me if I were looking to CC the P-83 regularly. I carry at a university (I love Utah for that), so the smaller size of the P-64 wins out over the additional 2 rounds the P-83 could give me for daily CC.
My P-83 is pretty much a range gun, with occasional trips on my hip when I OC (I like to rotate what I carry for OC, so all my girls get "fresh air" and attention regularly.

). So I can really go either way in regards to the hammer design.