We get a mix of coastal type snow with some deep dry pow days. Very few dry pow days like I've seen in Utah or Colorado though. If you run two sleds I'd set one up for the deepest days. On that sled I'd pick the 3.2 camso. Many of my friends have the series 7 and love it. In our snow both seem to perform great. I'd give the edge to the 3.2 or x3 in deep dry snow. The Polaris 3" does do better on hard pack with the stiffer lug. Is durability an issue with the Polaris 3" I've seen three series 7 tracks rip this season, and they aren't cheep. I do want to try the 3" cat track. Those are a rare sight here, but they sound good.
The 2.6 track is what I'd go with if I was running the same track all season. You can set an edge quicker, and it pops up better than any track out there. It does spin more than I like in the dryer powder. I ride on the pin much more with the 2.6. Deep pow days it stays taped. Also the 2.6 has been very durable except for the wear from the rails. And that wear is bad. 1,800 hard miles on it this season, and the lugs look new. I'm hoping the new clip location will fix that.