Can't comment on a kubota from an owners persoective only from a BIL perspective. My BIL has one, and I did/do compare the features of it.
I chose Kioti over other brands as also have a kioti dealer within driving distance, same could be said for JD and Kubota. I researched out what I thought I would need in HP and decided to go midline with the DK45Se. The DKSE's had a 40, 45 and 50 all in the same frame. My understanding was it was the injectors or something like that that gave you the extra umph. I have never felt underpowered.
I have owned it since new for about 12-13 yrs. I have over 750hrs on it. We too do blueberries (among other fruits) but for that though I don't need the kioti, I use a JDf1445 for its front mower agility. I did run the rows and used plastic mulch in the beginning (a mistake, became a fire ant highway).
The kioti is mainly for prepping the garden, front end loader and using the flail mower on our other property that has a lot of growth that tries to come up around our apple trees. I have a little too hefty chisel plow, disc, corn planter, fertilizer spreader, auger, box blade, grapple, powered bucket and the standard bucket and tiller. Tiller far and away gets the most usage of the 3pt tools, followed by the flail mower.
When I looked at BIL's Kuboto 2019 (I think)
L3901. I saw the 3 pt sway arms are controlled by a turnbuckle. I also noticed that the 3pt arms are fixed in length.
With my Kioti I can use a post inside a slider bar to move the arms left or right easily and quickly. The 3pt arms have an extension of about 3-4 inches when depressed in the event the attachment isn't exactly lined up. THAT is a really nice feature. I didn't look for nor see a 3pt attachment lift that can allow an operator to while off the seat easily raise and lower the 3 pt arms. Edit: It seems that at least new the MX series has these same features (kubota). Had to go digging around the bota site to confirm. It's probably just a model choice of the bells and whistles on there. I'd say those two things alone should be standard on all tractors.
This was my first new tractor. I came from an old mentality that you had to work on something every time you needed/wanted to use it (like 140's, super A's). I detested the idea of that, I had some $$ hanging around and got what I felt I needed. Had a ford 3000 that was very dependable but no PS.
Since I have owned this kioti, I have only seen one issue that drove me nuts. Turned out to be a relay and I posted about it here and a member gave the the answer, it was a relay (thanks again grsGreat). And I did have to replace the ignition switch after about 3-4 yrs. Easy enough to do as a non mechanic. I do mechanic work on it but from a need to basis vs a want to. I also put in the 3rd function valve so I can use the grapple. I would suggest you get the service manual with whatever you buy. If you plan to work on it at all. Even though my dealer is only a 20 minute drive or so (by tractor) away his wait times can be months. So I end up doing things myself, I work full time (today) so farming is my part time job. I often say I am my wife's unhired helper, she gets credit for the farm.
I haven't seen any issues with rust, bad welds or any of that mentioned. I do keep it in a sheltered area always. Mainly started doing that to protect the seat as the plastic seems to dry rot on most everything plastic now a days.
What would I change about it? I wouldn't mind the seat to be a little more air ride like. I pretty much max out the weight rating on mine (who am I kidding, I easily maxed it out). With that said the ride isn't uncomfortable.
