Well Owning both in the 07 year, i love both. So i will break then down for you
Chronic: Very stiff ski. Great flex through out ski. This will handle groomers like it is a race ski, its got a good radius on it. I Took this to Taos and did 3' pow and it did great.
Invader: Very soft, it has the carbon ollie band in it which once it gets to a certain point it snaps back. I have also ridden these in Taos in 3' pow it was weird but fun. These skis i ahve talken to big parks and have had a riot. They pop so nicley you can ollie over a 3' rope by leaning back and hitting that carbon ollie band,
Gripes:
Invadre: To soft some times, does not hold an edge on ice very well
Chronic: To stiff for all day use, i rip groomers mostly and end of the day i am beat.
Bottom Line: If you want a fun ski gi with invader if you want a real good all around ski Chronic. Money wise Invader is hella deal for a fun ski. Chronic's u gettin what you pay for.
I'd buy the invader if i had the choice and the knowledge that i do right know. Hope it helps man pm me if you need more