OP, be aware that this is a frequently debated topic with multiple threads on it here on TBN.
I love my turf tires on all three tractors and would not have R-4s. If you'll be running on rough ice and hard pack, even several inches of loose snow (as I suspect you will up your way) think seriously about turf tires. The traction is quite good with them already, better in those conditions than R-4s, and if you ever need chains, chains will actually have more bite on turfs because of more chain-to-ground contact. (On R-4s, some of the links fall between the treads). My neighbor has seven tractors, including a JD 955 with turfs, an 80hp JD with R-1s, and a Kubota M6040 with R-4s. He swears he will never get another tractor with R-4s because of traction problems in the snow and ice we have around here, compared with the turf tires. He has to use chains with them to plow (I don't), and although the chains let him manage well enough, he would much prefer using them on turfs.
Choose your tire type carefully. It's very expensive to swap out rear tractor tires later. (No pressure. :laughing