I just recently purchased a ck3510. I was in the same dilemma as you as to which brand to buy. In my opinion Kioti was the best of both worlds. I wasn't a fan of the treddle peddle and don't understand why Kubota uses that style. I also wanted the SSQA which opens up a whole world of attachments. I plan on using the loader to its capabilities so the stronger loader on the Kioti had me leaning that way as well. Also the big hump in the middle of the 3901 was not a deal breaker, but was kind of an annoyance getting on and off the machine. The Kiotis floor is a lot more flat. I've only owned mine for about 2 months so take this for what its worth. I'm happy with Kioti, has more than enough power, strong loader, and has done the tasks I have tackled so far with ease. I would suggest loading the rear tires as well.