I don't know the specs off-hand, but I'd bet the SE-R is heavier and that will offset the HP advantage to some degree. Last road test I read of the SE-R, it was a fun sporty car in a general sense, but handling wasn't it's shining point. In the twisties I'd vote GTI. On the straights, I'd say it'll be a tossup.
LOL@the dashstrokers. I don't think the nicer interior has much to do with which one is a better performer.
P.S. - In regards to build quality, I'd put my money on the Nissan for being cheaper to own in the long run and lasting longer without major repairs. Just a hunch.
Edit:
Nissan SR curb weight: 3357 lbs.
2011 GTI: 3,034 lbs. (2DR) 3,113 lbs.(4DR)