If you haven't, read the reviews for CK25 through CK35. All the same tractor with progressively more HP. My review is there. These tell you a lot about the tractor. Don't know anything about the B3300SU. I bough Kioti in 2006 because of:
weight, hydraulics, ergonomics, and value. Back then, nobody had anything to match up for anywhere close to the same money. Though, from what I can tell, the price differentials have narrowed in recent years. What's good about the CK series is that they've been around long enough that the design flaws have been corrected. You'd be hard pressed to do better.