This forum has obviously evolved to a mostly Kabota group but that proves they are highly popular and capable. The rest of us who own something else tend to hold back the posts until we get the change to chime in about our favorite brand (usually the one we own!) At first, that would seem like a brand loyal peeing match but actually I think it indicates that most people do their research and are happy with their purchases. I see VERY LITTLE BUYER'S REMORSE regarding UTV purchases.
There are some here who have personal experience owning various brands and their objective opinions and observations carry weight with me. The rest of us can only chime in with our personal stories of how our machine does what we want and we're happy.
Truth is, very few of us actually work our machines to their limit. I have a JD 850d that has been loaded with cut oak logs as high as I could possibly stack them 2 1/2 rows deep in the bed (about up to roof) and it hauled and dumped it fine. How overloaded? Dunno, but probably lots. And I pull cars around (and up hill) with it, or my 20 ft jet boat, and although these are all well beyond the "rated" capacity, the machine does it all without a problem. But you can't drive it across a stream because the belt will get wet and you'll be stopped dead. The 855d has a completely enclosed belt so maybe that is no longer an issue but I honestly can't say.
The vast majority of the hours I have on it are from driving it around the property at slow or moderate speed just to transport me and maybe a few little things from point A to B.
You have to go test drive these things to see for yourself. They're all nice, really. But some will likely appeal to you more than others. When you narrow it down to one or two, post here again with specific questions to people who own those machines to collect more data points.
They say the best two days of boat ownership are the day you buy and the day you sell. Well, for these machines I'd say the best days are the day you bring it home and every day you get to use it. Lots of happy owners here, all brands. (But Kubota owners outnumber the rest of us!!)
Good luck with your hunt.