Mannone is the better keeper in terms of what we have seen for us and long term potential. However, seeing the way NP was congratulating Guzan after the Derby game he is happy with the way things are going so I would be surprised to see a change at the moment.
I'd say whichever 'keeper we're more likely to be able to secure at the end of the season, if that's Guzan then he's the man for me, if it's Mannone then he's the man for me