My tractor had R4s mounted while sitting on the lot. I switched it to upsized and higher ply rated R1s. I live in the woods, do no real crop work with it and find the R1s work just fine. The R4s look tough and macho, but the sales guy thought the extra traction offered by the R1 design would be most useful on my hilly ground in the woods. I have had no problem with punctures, and the loader works just fine with one size wider 6 ply R1s in the front running at 35 psi. I don't mow lawn with it, but do some bush hog work, clean the barn up after the messy sheep and the donkey, clean up brush piles, haul firewood, dirt, rocks, logs, and so on, plus plow or grade the driveway as needed. We get snow in appreciable amounts for short periods interspersed with thawing weather, so the thing may plow snow one day and be in mud season the next while hauling firewood down from the barn to the house.
I'm happy with the R1s and would recommend them over R4s unless you plan to run around lawn areas with your tractor.