Cub offers Hydro driven tillers and they have some advantages such as the ability to turn the tines in a foward or counter rotating direction. The downside is the cost. The PTO driven units are more economical and they have proven reliable. On a larger and heavier tractor I would prefer the PTO while on the lighter garden tractor I would prefer the Hydro unit because of the counter rotating tines. With the counter rotating tines the tractor and tiller work against each other to better tear up the hard clay we have in our area. I guess the type of land tilling would also make a deciding factor, as in sandier land it wouldn't matter about the counter rotating tines as any tiller would till it.
The agrifab unit isn't such a bad idea. That way if you change from a Deere, to a Craftsman to a MTD (like that would ever happen) and not need a new unit. If you gave me a choice, the PTO is the way to go.
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