I hated HST when I was shopping, but now (owning one) I would never want a tractor without it. It's number one benefit to me: safety.
When shopping, I drove the 4610HST (closest to the current 4630HST, MX5000 and the TC45D. The MX5000 seems to be marketed as a "bridge" tractor crossing over from compact to utility. I was told it can be used to make hay because it is heavy and has the HP to pack it. There is no shuttle, so loader work requires a full stop to change directions.
The TC45D is a big subcompact. It doesnt weight enough for haymaking, but it can do a lot. The 16/17LA loader is one of the best around, especially since they fixed the joystick problems. Unlike the Kubota HSTs, two pedals on the right are for forward and reverse (no rocker). The two pedals on the left are for the brakes, so you can drive and used differential braking. Without supersteer, the turns are pretty sharp, but it digs up the soil a little. Supersteer prevents this.
Try the TC45D with and without supersteer - you can decide if the $ difference is worth it or not.
Mark
BTW, I think the Deere HSTs have a similar pedal arrangement.