I would go with the dedicated winter tires. In my experience snow traction can vary a lot with all season tires. I had a 2000 Blazer 4wd, with Uniroyal Cross-Country all season tires, traction was not that great in either two or four drive. With Firestone Destination LEs the Blazer had better traction in 2wd than the Uniroyals in 4wd.
Ed B.