All good points. Especially the questions about soil and rocks. I guess what should also be asked is, are your plots flat or level?
Everyone would like to own a late model tractor with a FEL, but you can do an amazing about of work with something as basic (and affordable) as a Ford 8N
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A 3 point hitch is usually a better choice, except for discing. A drag disc works better than a 3 point disc. But 3 point implements are much nice if you are working small plots where you need to back-up into tight areas. I'm not a fan of very many tow-behind implements. They suck when you need to back them up.
I'd also recommend that discs should have an adjustable pitch so you can change how aggressive they bite. The one in the photo posted above doesn't look adjustable. I'm not sure I'd buy one like that.
The OP didn't mention what exactly he'd like to plant. The answer will have a big influence on what type of tractor or UTV you need. I've become a big fan of the Throw N Mow technique for basic plots that are usually good enough for deer plots. A case in point...Last fall I wanted to brush hog some field edges that were being overrun with various invasive stuff. Multi Flora Rose, Mile-a-Minute, grapevines, and Oriental Bittersweet were the main problems. They were all spreading onto my pear and crab apples. I needed to open the area a bit. I brush hogged and then just broadcast rye and clover into all the mow trash. Fast forward to now...those are the areas of my plots that deer are feeding the heaviest. It's pretty amazing how easy it is to grow rye and small seeded stuff like clover and brassica. You barely need any tillage at all.