For what you describe, a crawler loader may suffice with some of the stumps, I have cleared many easements for pipe in easier soils, mostly pine, your conditions may vary. Are these pines deep rooted, or like most I have seen, on the surface, widely spread out, if so, those should not be too hard to deal with. A crawler loader, ie; 955, 977 cat or any of the various models, would likely hold up fine, they're built for working hard in all kinds of conditions.
Crawler loaders, may have track frames that do NOT oscillate over uneven terrain, that was the difference on older caterpillar tractors, between the track frames on non crawler loaders, they did move independently, better on uneven terrain. I forget with modern dozers, ran enough of them, do know there were times all I had was a 955 or 977 and I wanted a dozer on the site, sometimes you need one or the other.
A smaller dozer with 6 way, you don't have the strength of a larger crawler with a c-frame or straight up push arms, though 6 way blades are quite strong, there is no support on the ends of the blade so pushing with the blade corners to uproot stumps ans such, you can't over do it. Just stating the difference.
It sounds to me you would be better off renting an excavator, de-stumping, then either going for a dozer with a 6way, renting same, use that to grade, restore, spread top soil, fill in stump holes etc. The 6way is nice for road building, though straight push arms with tilt will allow you to grade the road with a camber, you can control road base material or whatever you are pushing a lot better with a 6 way.
Hardwood stumps may take more than a year, I'd seriously consider an excavator for that task, you can rough grade as you move, knock the dirt off the root balls so you don't lose top soil, lot of mobility with one of those when clearing. A root rake would be ideal next but you can clean up without it.
I'd want A D6 size tractor for that work, but modern ones such as a D4G, D5G, are plenty, the older they get, I'd want more than say a D3 or a Komatsu D21, D37, class tractor.