My salesman is also an actual farmer since childhood. He isn't a big fan of the R14s but did make the point about the stiffer sidewalls and wider tread/more stability but shallower lugs.
He isn't pushing one over the other; most of the advice I have gathered here and elsewhere puts the R14s at about 70/30ish over the R1s.
Yeah, the jury's still out on how long they'll last. Mine will probably outlast me, though, as long as I don't cut one down on a stump or rock. It's a completely different tire from R1 ag tires (not quite as aggressive bars) or R4 Industrial Tires. Good traction, yet they don't chew up the yard. Not sure how Goodyear achieved that, but they done good. Well, my R14s are Goodyears, at least. No idea if anyone else is making them (yet).
Forgot to mention, that I got my LX2610SU with oversize tires as well anticipating a backhoe in its future. That little tractor is VERY stable and has a pretty massive footprint for a compact tractor. I say little tractor, but it's every bit the tractor of an old 8N or similar, and probably more HP. Not quite as heavy though, which was my reasoning for having the tires loaded. Weight is work on a tractor. The only downside of the oversize tires was that I had to change the lift-links on the lift arms so they had a little more travel. My BB wanted to be a little too close to the ground to hook up, and adding a quick hitch only made things worse.
