R4s are a compromise of durability, substrate shedding, and spreading psi's out over the ground. They aren't the best for traction, they aren't the best for being gentle on a lawn. They are the best road tire.
If you have a fairly dedicated regimen, R1s are your best traction, but will shed/dig material and cut into soft ground.
R3/turfs are best for lawn work and snow/sand situations, and comfortable on hard surfaces, but soft rubber.
There are neat tires like rice paddy styles that confuse the issue too--they have good flotation like a turf, but still have aggressive tread.
I have Titan R4's that came on the tractor--JD 'new style' back in 2006. They have fewer plies than the 'old style' R4's that have perpendicular barring. Mine are better flotation & a gentler curve on the tread. Industrial tires hold up better for hard surfaces. They've been good.
What's the work you tend to do? If its all over the board, the R4 is a good choice. Mine don't shed material as well as I'd like--fill up with wet soil, mud, clay and then I've got slicks. Even snow can pack them when conditions are right--it really sucks having slicks in the winter
I'd get wider spacing on narrower bars if I got R4 again, and try and get my psi to the ground up, but would look hard at R1's--I am not on hard or well-finished surfaces very often, and snow season is for pushing back banks when the truck has run out of room--not enough to justify chains, which correct ice and snow issues on any style tire they'll fit. Don't know where you're at.