The "choose a dealer near you" thing is a consideration for repairs.
Moving tractors isn't necessarily the easiest thing for a lot of people, as it requires a trailer and a tow vehicle; obviously the bigger the tractor, the heavier-duty the trailer, and potentially a much heavier-duty tow vehicle.
Choosing a brand with a nearby dealer means that it may be economical to have the dealer pick up & deliver the tractor to you for repairs instead of you investing in a trailer & potentially a truck.
In my case, I ended up with a dealer that's 110 miles one-way. They delivered the new tractor free (this depends entirely on the dealer), and I have a 1-ton pickup and figured I'd eventually buy a flatbed trailer. I still haven't bought the trailer, though I've rented one locally ($100 per day) for an entirely different reason, and my tractor hasn't needed to go back to the dealer once in over 7 years now. Considering that a decent used flatbed for me to haul my tractor (~5000# without the backhoe and loader) would cost $4k+ if craigslist is anything to go by, that's 40 rentals to pay for a trailer... and given that I haven't needed my tractor serviced by the dealer, I suspect I won't be buying a trailer for a while.
YMMV, but it's quite possible that a quality tractor won't need dealer servicing at all, assuming you don't mind performing filter & fluid changes (there's a lot of hydraulic fluid - which is very much like motor oil, except it doesn't turn black; and then there's also motor oil, much less of it, and it will turn black being in a diesel motor). Considering the costs and bother of transport, and amount of time a dealer may take to get around to doing a fluid change for you, I'd advise getting used to the idea of dealing with the oils myself; it doesn't happen that often and it's not difficult, though it can be messy.
Also, you need to grease the tractor pretty often. More often than I do, in fact; I need to do it more often...
btw Many auto parts stores accept used motor oil (which includes the hydraulic fluid) for recycling.
Someone above mentioned TYM; TYM bought my tractor's maker (Branson) in the last few years. I strongly encourage you to consider a not-too-nearby dealer of a different brand as well; I'm still super glad I got the tractor I did and honestly don't see the near-religious zeal some have for Kubotas. They're pretty much all the same at this point.