UTV does one thing better than a tractor. Transport more than one person.
Every "work" aspect is trumped by the tractor w attachment. If you are just going to move your person place to place and do manual labor at those spots, then the UTV would shine. If you are lazy (like me) and want a machine to do that work, then a tractor may be best - depends on the work being done and the attachments you have.
A good used tractor like a ford 3000-4000 series will run $6-8,000. Add 500-1000 for one with a FEL. Add 2-3000 for a set of used attachments like a rotary cutter, plow, disc, forks and you are still UNDER the price of a 'bota UTV. Won't have that "new vehicle smell", but after hauling the first pile of manure nothing does.