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Where do you live? That makes a BIG difference.
Both a tractor and a fixed coop need to provide the same things, i.e. sufficient roost space, sufficient nest box space, and potentially room for feeder and/or waterer (depends a lot on your climate, predator situation and management style). The only difference is a coop can be bigger than a tractor can, and tractor can be moved about the yard where a coop can't. A coop may take a little more $ to build in terms of materials (or it may not, if you just build a reach-in coop rather than walk-in) -- however it may be a lot *simpler* to build than a *good* usable sturdy winterproof tractor would be.
The thing is, a tractor can be real tough to keep sufficiently warm *and well ventilated* in the winter, because it is so small and low-volume. If you live somewhere it doesn't get real cold, fine, but IMHO if you live somewhere that will experience freezing weather for a month or more, there is a LOT to be said for a proper coop. A proper coop can also give the chickens a bit more space per bird which can prevent a lot of problems if you often experience non-chicken-friendly weather that keeps them wanting to stay indoors for days on end.
The ONLY advantage of a tractor is that you can move it. But if they will be free-ranging most of the time, that's not a real big deal. Yeah, the ground around a fixed coop will get a bit more thrashed than the rest of the ground, but you know, at least that concentrates the chicken damage in one place rather than having them moderately-damage a *lot* of places around the yard, which tends to happen unless you are extremely careful
BTW a tractor door does not have to be in the floor. Many (most, in North America, I would venture to say) have the door in the side, just like you would in a fixed coop, which is more space-efficient with your limited floorspace.
Hope this helps,
Pat