if you want a play sled 2 strokes rock, they are lighter and the power is awesome.
if you want to stomp huge chutes a 300+ hp nytro is the way togo.
If you want a mix of both, a m1000 arctic cat with a race gas turbo can do over 300hp as well. There are m1000 big bores with turbos pushing well over 300hp
I would say the etec and rmk 800s are taking boost very well. Not in the same league as big boost 4 strokes in raw power. But the weight makes them way more fun to ride.