I dont think a cab is such a good idea on a CUT. They usually dont have too much hp to spare which limits the effectiveness of the AC (or remaining power to do real work). Also, the cab is usually too high to fit in std 7 ft doors and makes it tough mowing around trees and such. That said though, I really like a good canopy which is nearly as comfortable under the hot sun as an AC cab. I like cabs on big tractors and would much rather have one on those, but no way would I want one on a CUT. Usually the big tractor dont fit in a 7 ft door even without a cab, and the power draw for a good AC is insignificant with larger engines.
I wouldn't say Kubota is a better tractor, but both are good tractors. Yes the Kubota will hold its resale better, but a cab is a expensive option and the Kubota would be much higher priced if it had a factory installed cab with heat, AC, and Stereo. You should consider if the cab will be in the way with your intended use and if it is, the TYM 433 is also available without a cab and should save you a few thousand, if you go that way. Any how compare the specs on the two tractors and make your decision, and good luck with it.
...Kubota is in a class by itself...