We have small acreage and are clearing a 20 acre section of fallen timber. We use a tow behind flail mower with our Kawasaki 600 mule. It does a brilliant job of cutting through thick tussock grass, weeds and crap. It also handles the odd hidden log, big tree root or rock. We just go at a walking pace with the Kawasaki in low gear.
It has transformed our lightly wooded center section.
We can't get the tractor on a wet property but the Kawasaki will.
It is early days yet, but we love the UTV/Flail mower combination at the moment.
Future mows should be easier than current churn through thick long grass, weeds and vines.