Ive driven both as well. The 600 is great for ditch banging and can handle like a champ. The 900 is great for raw power and can still handle great.
Where are you going to ride the most. Open lakes (900) or tight trails (600)?
I am more of a ditch banger myself so my 1000 (T-Cat) sits a lot while I ride my F7. I prefer the lighter sleds.
The best way to solve your problem is to get both
