Both of those orange tractors are good machines ... and like has already been mentioned, very different machines!
The B2920 is more physically comparable to the CK20 ... as the CK30 is a slightly larger class. Obviously HP is higher in the B2920 than the CK20, but otherwise they are very similar. (I used to own a CK20 & my buddy had a B2920). Dollar for dollar, you will get more with the Kioti than the Kubota, especially when you consider you're getting a "next size up" rig for the same $$$.
Quality wise, I would say they are very comparable.
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When speaking of dealer support, that really only applies on your initial transaction, and the very few times you'll likely EVER go back for service. My Kioti went back to the dealer for a warranty repair early on, then a quick repair on an O-ring gasket a bit later. Otherwise, I performed all my own service, and we can get filters and other items online/shipped to our homes.
These days, most any new tractor, regardless of color or brand name, will be relatively trouble free. So my point is, while a vast dealer network may seem like a big deal, I don't hold it in as high esteem as others seem too.
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Regarding that New Holland... yes, LS makes it (except the loader; LS uses a stronger one) ... and sells it under their own name for less money. LS is building a nice dealer network themselves, and sales seem to be going well.
My LS now has around 140 hours and has been trouble free (although I did blow a headlight fuse a few months ago
).
Best of luck to ya, there are lots of good choices out there, just pick the one that you feel best about.