If your thinking of doing any mods down the road. Like boosting it. I would go with the nytro.
Also depends on the type of riding you do.
Hard to beat a stock sled that is in the low 400lbs.
Also you are in the battle of 4 VS 2 stroke. I would try to get on both for a test ride.
Myself I own a turbo rx-1 and a 08' 800r XP. To different animals. They both ar the best at what they do. TRX will climb anything you point it at and the XP is effortless to ride.
Good luck in your choice.....