Lots of great answers here.
Have 2 old diesel 4x4 mules here (had a gas gator before them). His and hers, a 1 row w/ dump bed and 2 row six seater. Run on ag diesel they will go up anything (have some steep slopes) no problem, have dragged some 1500lb rocks no problem. They are pretty much in constant daily use. The 3 cyl diesel is strong, sips fuel and as minimal maintenance as I could imagine. In process of adding a small trailer so I can move around a generator easily. (we have a tracked skid steer (CTL) with many attachments for the heavy lifting/work (grading/trenching/digging/augering/mulching)).
Although one neighbor here has Gators, the biggest one has a fleet of Suzuki samurai's and some rolled ford explorers with the roofs removed, the rest are a mixture of Polaris, Kubota and Mule. Those with Polaris mostly use them for driving around rather than actual work. One recently commented while riding in the mule, that it felt like a much more rigid frame than the Polaris he was used to riding in. As others have commented, work or play?
If we replace these we will likely look at a Kubota or mule, 4x4 diesel with locking diff.
The one row seat can easily seat 3.
The 2 row with fold down/extended dump bed seems to be a highly practical option.