One dealer wanted to charge me and extra $2000 for AG tires because he had an R4 model at his store already. IF the deal is right, I wouldn't shy away from either type of tractor. On my old property, it was on a side of mountain. The slow control of hydro felt more comfortable. I drove both L3200 and L175 over there.
My brother in law has tons of tractors. He buys the biggest case tractors often for tillage and to jockey alongside the combines unloading grain while moving. He seems to buy a L series kubota every 2 or 3 years for the dairy part of the farm. Likely buys another one or two for the CT and finger lakes farm he manages too. All of them hydros, some with tons of hours. Think he sells them around 4-5k hours which doesn't take long. No problems other than flat tires, and damage, like poking something in the radiator, breaking a light. He has bought a B series or two over the years. These tractors are for cleaning the barn, moving feed, fixing fences, road repairs. He also has a few big front loaders for the feed, ones like quarrys or highway departments use. Thehydros in the kubota side by sides are very reliable too. Only downside they get stuck easily. Not much suspension travel or mean tires on them.