in my personal experience, a loader ( backhoe ) is not the greatest tool to scrape off brush, I have done it but for the most part I have just laid them over, but the backhoe itself sure comes handy popping stumps especially if all you are talking about is overgrown brush a little too big for a brush hog, most I got in one pop, some larger ones, 8" oaks maybe 2 or three, foot or larger, a half dozen, and if you plan on farming and put a plow to the ground, I would prefer to go about it that way, its actually the route I took, we snaked in between the larger ones, with hatchets actually, got the ones I could get in a couple swings, small chainsaw on the 3-4" ones and backhoe on what was left, the brush just ran it over with the loader, than we plowed and popped the rest of the roots, lots of work but running it over with a loader, not sure what would happen when you try to plow it, or if the lots you have done at work were plowed afterwards or just brushhogged or simply left alone.
now a dozer on the other hand, although I have been advised to get one in the first place and I cheeped out and when I spent some money I got the hoe as its a bit more versatile and than a farm tractor with various attachments among which a box blade, I finally got involved into a project where the other party brought a dozer, a nice larger one, he scraped in a half an hour what would have taken me a whole month, it was frozen and he scraped the frost and 12 inch oaks stumps and all, didn't even hesitate,
now I cant afford that kind of dozer but I started looking right away and just recently got me a small beater, guess I'll still use the backhoe for the larger stumps but for the most part I should be able to snake in around them and get most the brush
now granted its on tracks and you need a trailer to get 3 miles down the street, but you said it yourself, when its dry you may be able to use a wheel loader, by than its too late to plant, if that's all you are doing maybe renting a decent dozer for 1 day might do the trick.
I like to own my own stuff, and its my own property and I will need the equipment years later too, so I made my choices, to each is their own, my dozer is a 70s IH and parts availability is not the greatest, I would suspect the loader to be similar, not sure if there are any IH dealers left, on the other hand I was pleasantly surprised how affordable the parts I needed were at the jd dealer, I usually avoid dealers period.
either way depending on what you are doing and what those lots look like a wheel loader does not sound like the tool in my experience, if you already have a brush hog, spending a day on foot with a chainsaw cutting larger brush, chain it drag it out, and run over the rest with the hog may not be such a bad way to go about it, sounds like a one time deal you'll be plowing after that.