The amount of tread on the 4 seasons is not worth worrying about one way or the other. My understanding is that Gatorskins are tougher, although the only flat I have had on my 4 Seasons (in a year) was a nail that went straight in. In the wet, the tires you are talking about are too narrow to hydroplane, if you are riding in snow you need REAL tread, and ice without studs is a challenge. Personally, I would by a thick, heavy, cheap tire from Nashbar or Performance for the winter.