Not sure about the cable winch set ups but I have the capstan winch.
One of the biggest differences is that a chainsaw winch will only hold so much cable, 50 ft or so depending on the size of the cable and how much you can spool on the drum. With that I would think that you would need to have anchor points for the winch within that distance.
With the capstan winch I bought the complete self contained unit motor and all. You can also buy the capstan gearbox assembly and mount it to a chainsaw power unit but then you would have to also manually run the throttle or rig it at a desired rpm.
The complete assembly weighs 16 lbs. and then I have 300 ft. of 3/8" polydac rope. I think the winch has a 2000 lb working load range with a 2500 lb max load limit before stalling the motor. The 3/8" polydac rope is a low stretch high strenght rope rated at 3800 lbs. or something like that and will not melt to the capstan drum when it gets warm.
I use it when hunting and it has more than paid for itself hauling out elk. The downside is that it has one speed and its slow. I don't look for the easiest way out I go the shortest distance in a straight line because it pulls the same speed up a near cliff as it does on flat ground. The upside is it will pull a whole elk up a hill faster than four guys can pack it because its steady going and your not tired from packing but once on flat ground its quicker to pack or drag.
I bought mine quite a while ago and at that time they were two stroke power units. I think you can now get them in a four stroke version.
