I think the quality of the Kioti is every bit as good as the Kubota. A good friend of mine is on his 2nd Kubota. When I had my Kioti, he had a nearly identical (sized) Kubota. I had a problem that needed dealer attention (O-Ring gasket in the steering assembly) and he had a similar problem with a loader connection. Both dealers were fantastic to work with and took care of us. His advantage was that the Kubota dealer was only 2 miles away, and my Kioti dealer was 15'ish. The only difference was price, as mine was cheaper. Also, the Kioti models will typcially come with more features already included... like a better seat, a standard remote, etc. Kioti also has a better warranty than Kubota.
If people are still claiming that "resale" value may be an issue... I can say this. I had my CK20S for a year and around 200 hours. I bought it for $12,700 and sold it for $11,700 (approximate, don't remember the exact numbers now). That was a private sale, and I did very well. On the Kubota, he took a little bigger hit on the trade-in (percentage wise) than I did, but all-in-all, had he sold it privately, I think he would have retained just as much value (percentage wise) as I did. Perhaps I got really lucky with my sales price, or perhaps their resale value is finally catching up the Kub. Bottom line is, both are excellent machines. I think that their current reputation puts them neck-and-neck, and the pricing (and usually the capabilities) favor Kioti. BUT... Kubota also has more model options than Kioti does, so it's easier to find the "just right" tractor from Kubota than Kioti. There also seem to be more Dealerships for Kubota, so you may have an easier time shopping.
If your purchasing though... do like everyone says, and sit on both, test both, compare them feature-to-feature (I like making a spreadsheet to compare line-item by item). I think "dealer support" is important, but I don't stress the importance as much as some other folks do. Most of these new machines, from most companies, are good quality anymore. An "amazing" dealer is only applicable if you have problems, and the majority of these new rigs don't. If you need to source parts, filters, etc... most of them can be found online and delivered to your home for the same price (if not cheaper) than a trip to the dealer.
And I'm not saying anything bad about my dealers (Kioti or LS) as they are/were both fantastic... but I don't think a dealer is the main shopping concern you should look at.
My 2 cents anyhow.