I have had both a diesel Gator and an 825i, which I have now. I push snow in winter and pull heavy trailers and loads on hilly property. I prefer the 825 as it has much more power. The downside is that it uses a lot of fuel, especially under load and it does rev fairly high to achieve its power. You could plan on using about double the fuel as you would with a diesel Gator. My neighbor has a Kubota RTV 1100 and it's a nice machine. For a pure work machine the RTV is a good choice, but no better one than the Gator and it just does not have much power, so it is slow as molasses and really struggles in off-road situations (I take my heavy tow strap any time he and I are doing any offroading). Despite all the talks about CVT/heavy work, I have never had any issue with the CVT/belt on any Gator I have owned and that has been several. For purely light hauling and pleasure of driving around I prefer the ergonomics of the Polaris Ranger, but it simply lacks the low end grunt of any of the machines mentioned. I had one, liked it a lot (the 800 EPS), but no comparison between it and the Gator for heavy work. I also pushed snow with a 72" plow and it did fine, though I was careful about only plowing in low range.
John M