Each has advantages, crawler loader, you can dig, carry, load, haul things around, but if the distances are long, you'd be better off with a wheel loader. Dozer is nice for grading, fixing roads and such, liklely more flotation in soft ground. One difference between the 2 is that, well on older caterpillar tractors is that the track frames would oscillate on a dozer, and not on a crawler loader, meaning the dozers track frames will contour to rough terrain, vs being rigid, making a crawler more stable for loading trucks etc. Something to know.
I like both, I've spent a lot of time on 977L's and 955's and have cleared, loaded trucks even had forks on the 977 and distributed ductile iron water main on easements for the pipe crew, keeping ahead of them. 4 in on bucket is nice, but there were times I just needed a dozer with at least tilt. Pads on the crawler loader will likely not be aggressive, you can put dozer track pads on, and I've seen tractors with them, but most are double or triple bar, not very tall, and will slip more in places where a dozer with good pads won't. Crawler loaders while still a useful tractor, have gone the wayside due to hydraulic excavators being much more versatile, but I'd still take one if reasonable, you'll really want to pinpoint the work you want to do before deciding.
Do make sure to measure up an undercarriage, like said in the previous post, eyeballing is not a good idea.