As a fan of the british one from when it came out on TV over here in the UK I still prefer the American one.
I do admit it took some time to adjust to the americanisation of the original but I think the fact it's still going after many more series and episodes than the UK one shows it's going great guns!
I can't help but wonder if they did a UK version of some of the recent american episodes then they'd maybe be ten times more awesome, they could have easily done a third series of the UK one if the BBC weren't so afraid of it falling off like a few other shows (Little Britain, Harry Enfield and Catherine Tate, who wasn't even funny in the first place)
My favorite Dwight moment was when he was crying in the stairwell, heartbroken over Angela. Jim comes to console him but quietly leaves while Dwight still has his face buried in the corner. Dwight then turns to put his arm over Jim but there's no one there! I guess it's funnier to watch than to describe...it was such a touching moment between the two mortal enemies LOL...