Take a look at the specs again.....the only reason a BX23 "Looks" smaller is because of the wide, lower profile tires. The side by side specs are not very different. One thing I can assure you, if you situation ever changed, the Kubota will have a lot more re-sale value than the Kioti, whether you trade it in , or sell it yourself.
The CK20 is marginally bigger, but is rated for less power. The engines are within 1 cubic inch of each-other. The BX23 has a higher
PTO HP value. The only argument I see Kioti guys using is the "Weight" value....Just because something is overbloated, does not make it "Better" yet that is the rallying cry of the Kioti faithful. In fact, with that extra 400 pounds set up so high, it would be safe to assume the unit will have a much greater propensity to tip over VS. the BX23.