I use a J.D. pull behind 48" core unit with C.C. blocks for ballast. I have used it for about 10 years! I have yet to replace the core teeth, but they are ready for replacement. The unit has worked well on many lawns. I like the simplicity of it, not much to go wrong.
I have used powered 3 pt. units and of course they worked well. I have used the walk behind rental units, and will again for small turf areas. It always seems to me like they go alot faster then they should, I guess that is the nature of the beast.
I tow the J.D. unit with one of the smaller tractors and find it works best for my needs. Obviously, soil condition is critical. I do my aerating in fall or early spring. With soil conditions right the unit will leave uniform 2.5" to 3" plugs.