To help your research:
MF compacts are Iseke
RK are TYM
A while back, RK imported some tractors, dropped the idea, then picked it up with another maker/brand years later.
That is a risk with any retailer, they are in business to sell 'things'. They are not in business to service things.
A dealer is more likely to stick to something longer.
I am not knocking RK, I drive by mine 2x a day (usually only go in 1x/week) - but if you are wanting/needing support, repairs, options - they are not the best choice.
[not their fault, it's not their business model]
Also, go visit the service dept of all your local and not-so-local tractor dealers.
If they treat you and the other people in there decently, then buy their machine.
You are not going to find a ton of difference between one compact and another since there are only like 5 OEM's out there and they all copy each other.
(sort of like telling the difference between small SUV's. There may be some subtle differences, but none of them are going to win the Indy 500)
AGCO has several flavors, I don't recall if all of their labels are carrying compacts.
I have had nothing but stellar service from AGCO & Deere, I started with Deere because they were cheaper [yes] than the other choices back in the 90's for a 4100 sized machine. I was only visiting places that serviced their machines right there, and if it was a single guy working out of a former gas station, I passed him up.
Nothing against those guys personally, but a one man shop has limitations that a larger operation doesn't. (like if your machine needs something and the guy is on vacation - or died - or lost the shop in some other manner).
The dealers I use are both 3+ generation shops. I expect them to know tons more than I do, and they do. I have not had any serious issues with the machines [6 over the years], but the minor things they can talk me through a diag over the phone & have always had what I needed [information and/or parts] right there.
Good luck with your journey & keep us posted!