I've been playing a lot of both lately. I don't have nearly enough hands in my PT database to get a feel for what my true winrates will be, though I'm off to a good start. Does anybody have a lot of experience playing both, and if so, what difference in win rates do you see between the two?

I am not sure there is anyone here what plays that much NL but it has been discussed on occasion:

forum/viewtopic.php?t=3601