I believe I'm a bit out of my league, if we are talking 150K and 200K for machines
I have a 32" 12 tooth blade skid steer saw. $3000 when bought new. Now costs close to $5000 with improvements. Will cut a 14" tree at or below ground level in 1 pass. Can double tree size by working both sides of the tree. I do not try to control tree fall and generall finish large trees by pushing over. Smaller trees 15" and under fall to the side of the saw due to saw momentum.
Most common nuisance trees are Osage Orange and Locust generally less than 15" diameter.
My Skid Steer is a 57 HP wheeled 1845C Case. It has Hi Flow hydraulics 30 GPM @ 2500 PSI which calculates to about 36 hydraulic HP. My cost was $11,500. It only has 5600 hrs. Would like to have tracks.
72" skid steer mounted bushhog $4500
$1500 for a trailer to haul. **** I've got more money tied up than I thought.
I purchased my equipment for clearing my own land, but have done a lot of custom work against my will. I just throw my wallet on the table and tell the customers to "fill it up".
We are able to burn in KS so a mulcher is not required. Do all my tree piling with the skid steer. Kansas is also blessed with lots of flint rocks in my area that do not mulch well.
As Mr. Hegwood said it depends on your goal and expectations.