You can move round bales with a bale spear on the Three Point Hitch, or a SSQA bale spear mounted on the FEL in lieu of a bucket.
You cannot lift round bales more than a few inches using a bale spear on the Three Point Hitch, but you can transport bales using a relatively small tractor.
Lifting round bales on the FEL, high enough to stack bales or load trailers, requires are 65% to 80% heavier tractor to provide stability. Damp round bales can weigh 2,000 pounds.
Contemporary tractors have relatively powerful hydraulics but requirement for tractor weight, to decrease likelihood of tractor rolling over when lifting with the FEL, have not changed.
If you have not operated a tractor before you will be surprised how dangerously unstable tractors are transporting heavy FEL loads over rough ground.
What do you need to do?
A new tractor capable of lifting/transporting one ton round bales on the FEL will cost around $25,000.
Roto-Tillers do not require much PTO horsepower, nor tractor weight, to operate.
SSQA = Skid Steer Quck Attach, a universal standard.