Having owned both types, I would choose the PTO over ground driven anytime.
With the PTO you can unload the spreader anyplace. If you can’t get out back in ice or snow, you may just have to make a pile until weather or mud, allows you back out in the fields to spread. You just back up run the PTO until spreader it empty, put the spreader and tractor away again until you back up to dump the next load onto the pile. Having the FEL you can pick up that pile when conditions allow spreading again, put it back in the spreader and dump it on the fields.
Ground drive does work for spreading, but has less “power” to push a load off with chains and bars, beater bar. You have to have PLENTY of space to drive around while emptying. You might have to make several trips EACH LOAD to clean off the bed. So when you go over the same ground 3-4 times a day, day after day, it makes for mud, torn up grasses, lots of wear and tear on your land. You will need to fix that come spring, find other places to drive for unloading. Small farmette may have limited places for spreading, so you can not avoid going over the same ground many times.
Not emptying spreader daily is much more likely to mean you have to shovel off the ground drive load when it freezes, since chain doesn’t have the power of the tractor to move chain and heavy load. You CAN break chain with the PTO trying to move a frozen load, since it is now a chunk and PTO machine is not made to move solid loads like that. So letting ANY manure load sit very long to freeze, can mean you shovel the spreader to empty it, to prevent breaking the chain under that kind of load.
I empty my spreader DAILY, large or small load, to prevent floor rot, rust on chains, bars, walls. And I SURE don’t want to be shoveling frozen manure out of my spreader ANYTIME. Way too much work!! We have between 6-7 horses who are barned daily, with stalls cleaned daily. I need a spreader that works hard, not a toy or decorative model, holds a fair amount so cleaning is one trip thru the barn each day.
PTO spreader is best for me every time. Maybe you can find a used PTO one, not as expensive as the new spreaders. My 3week old one, is at least 30 years old, but works WELL. Sold the older, worn PTO spreader, for parts, with buyer HAPPY to get his hands on it. Box will probably be resold by him as a wagon for just hauling stuff like firewood. Plenty of older spreaders around if you look, for various prices. Craigslist is good for hunting.
We found the “new” one parked beside a country road with a For Sale sign on it. Farmer ran it for us, watched the PTO power the chain going around, beater bar worked, showed us how to set the speed for dumping (hadn’t had that on the old one!) so we could change settings if needed. Some dickering ensued, and we owned the spreader. It sure is RED since husband painted it!!