I'd seriously consider reliability issues because some makers have a worse track record than others. I remember a post on here about an outwest guid who's fleet of sleds were Polaris pro RMK and half the sleds blew up the first year, the best chassis but kaplow they go.
Cat 800 in xfire or M is real nice. The doo' 800 E or P tech's are crazy power, very stable ride kinda hard for me to carve but my buddy flick them around like a rag doll and he weighs 150. Look how the cat 800 are bullet proof and the poo's are not, now direct drive poos failing all over the place. Cat reverse on the 4 stroke is a problem but not really apply to mountain riding with the 4's yet.
Personally after riding them all and looking at problems from the manufacturer's I'd take a cat first, than doo than a poo. If poo could do what cat does with motors I'd do a poo. Cat just knocks it out the park in all categories I'm leery of Doo's sealed bearing on cranks and the ride is to stable on doos FOR ME THAT IS. Yamaha is out of the picture so enough said there IMO and by the way I own 5 different Yamaha sleds now.
Remember, this is my opinion, I'm not bashing them.