Well if you get much more than 6" on the road, I am guessing you are pretty close to having it closed. Generally speaking the truck will have better clearance and ability to plow through deeper snow. Suby outbacks also have pretty good clearance though and can get through a lot. If it had snow tires, I'd say hands down go with the Suby. From a convenience standpoint the Suby wins, though I'd pack chains in it still.
road closures are not an issue, up in mccall where brundage is if people want to go somewhere they dam well will, and up to bogus it has only been closed once that i can remember when last year some tards in some econo cars crashed and blocked the road, that was a waste of sitting at the bottom of the road for 3 hours waiting for it to open...but anyway the reason i ask is because I was looking in the subie's owners manual and i said it didn't have clearance for chains, so that was why i was asking. on a normal day with hard pack or a few inches of snow, definitely the subie. it fits more people and its awd so i wont need to deal with chains, however i could care less about putting on chains. But it wont have snow tires, so if the shit got sketchy and there was a good dump over night or it snows all day im thinking i would have more traction and better stopping with chains even on a rwd mini truck.