The very best, do it all maching out there is a backhoe. A full sized, commercial, yellow iron, 80hp backhoe. A 60hp dozer is useless at clearing land. It's a toy and only good for leveling off dirt that has already been dug up by something else. You will not have enough weight or power to dig through the hard pan with it. Even 80 and 90 hp dozers need rippers to break up the ground before they can grade it.
Taking out one small tree with the dozer might be easy. But then when you get several on the ground, you will find that a small dozer is terrible and moving them. It will only be able to handle a few of them, and it will not have the weight or power to turn while pushing.
The little backhoe will do all that you want it to do, but it is too small to last very long. Bigger means stronger and more durable. All your commercial backhoes are in the 80hp range. Some are more, but those are the bigger models. You just need a regular sized backhoe.
Ideally you want a 4 in 1 bucket and 4x4. The 4 in 1 bucket is important because after you take out the trees with the hoe, you can pick them up and carry them to the burn pile. The very best, fastest and least damaging to the land way to get a tree to the burn pile is to pick it up. The dozer is a nightmare for this, even with a rake, it sucks. My dozer is 170hp, it's pretty good sized, andI rarely use it for tree clearing. When I do, I just knock them over and open up an area enough to get the backhoe in there to clean it up.
The backhoe is capable of taking out any sized tree. I've done this thousands of times and it's fast, easy and safe. A 60 hp dozer will be severely limited in what it can push over and even more limited to what it can dig out. Because it takes a lot of power to get through the hard pan, or first 6 inches of soil, the small dozer is almost worthless at land clearing and impossible at taking out just medium sized trees.
For strictly taking out trees or digging dirt, and excavator is much better. Your tractor can drag trees faster and easier then an excavator can, or even a dozer. For digging dirt, and you only have an excavator, moving the dirt becomes a challenge. With a dump truck, that becomes a lot easier, but then spreding out the dirt can become problematic. A dozer is great for this, but no you have three pieces of equipment to do what a backhoe can do. Problem with the backhoe with digging a pond is that you can only haul one yard of dirt at a time. I dug my 3/4 acre pond this way. It was very time consuming, but I stuck with it and eventually got it dug. After awhile, I just dug the dirt and hauled it out of the pond just to get it dug before the rains arrived. Then I spent half a year, hear and there, hauling off that dirt one yard at a time.
Digging is always easy, it's what you do with the dirt that takes up all your time.
Good luck,
Eddie