tire choice might depend more on what else you will be doin' w. the tractor after the snow is but a memory ...if you are gonna be in the muck, then R1 (those big V-shaped lugs ...i.e., the "real" tractor tire") might be right for you ...if you are workin' a loader hard, R4 industrial tread might be your favorite, and is more compatible with chains than R1s ...if you are mowin' lawn, then turf's do the least damage and are actually most "chain-friendly"
...again, depending, chains provide extra traction in mud, wet leaves, etc. as I posted above, my choice is "turfs" and they are loaded to counterbalance my FEL ...and, they work quite well in the snow, but for hills and ice, chains are my answer, as I posted above