PTO Stump Grinders
I started off with a woods/stumpbuster (the woods models are made by someone else) and it did not last. It was matched up to a NW TCA 55
Converted to a Miller PRO 75T and have not had any problems since then. It is a beast. The guy at Miller used to be a Vermeer design engineer. He makes alot of the parts himself and does the assembly, replacement teeth were $5 as of last year. If you do a weight comparison, you can see the differences, more metal in the Miller, I can not only grind side to side/up and down, but I can go in and out without moving the tractor and this reduces the number of times (usually no more than 2 for the really larger stumps, 1 set up for the smaller ones) to position the stumper over the stump. I grind mostly cherry, maple and beech with rocks interspersed (softer, sedimentary stuff, no granite). The Miller also has a plow so that when I am finished grinding, all I have to do is back up the tractor while adjusting the draft/depth of the plow to push the chips into the hole/smooth out the area if I am leaving the chips which is usually the case. The other model throws the chips all over the yard as they are chipped away from the tractor. You can set up sheilds for the Stumpbuster/woods but that is a hassle imho.
But hey, if the woods is working for you, great! The stumpbuster model was $4500 and the Miller was $7900. I was able to get most of my money back on the SC 50 stumpbuster fortunately. I also have a Morbark PTO chipper than runs off the tractor. I will group the stumps together and grind all at once instead of switching back and forth all the time. Most customers are ok with this at least for me.