I've had R4's in the past, they were horrible in the snow. I bought a tire groover and cut them, it made a huge differance. Trying to get up a snowy hill one winter, not doing well on my cut R4's, along comes my neighbor with his R1's. I expect him to do terribly because they have a very small contact patch. Up the hill he goes. I was amazed.
My brand new tractor came with R1's. I'll see how they do in the snow. They are supper aggresive to my gravel driveway. I would never put them on my lawn. If they don't pan out, or when they wear out, I'll replace them with R14's.