3pt is so much more handy in every single way except maybe for the 5 minutes to hook it up.
Maneuverable for corners, backing up for any reason, adding weight to the rear tractor wheels, clearing out a plug, and on and on. No wheels to pay for or maintain. Easy to lift and lower, no troubling trip mechanism or hyd cyclinder to find and install. And on and on.
You would be in the vast minority to prefer a small trailer plow over a 3pt.