The most aggressive tread would be the standard R1 tires. I think they are about 43" in height and maybe 10" wide (I cannot find my OM to verify). I suspect they would do well in snow. They look funny to me because of their height and relatively narrow width. I have a mid frame machine with the R4 tires from Galaxy. I have never moved snow with the new machine I have, but I had a 4310 and it did fine with the R4 tires. Chains would be the best, though. I am contemplating buying a set for this winter here. I would suggest finding the useage that the machine will spend most of its time doing, and buy the tire best-suited to that. You can make accomodations for the other things.
John M