Not an engineer, but fortunate to fly with several very knowledgeable types...and I'll toss in a bit of personal observation, so here goes.Seems that the pusher provides a welcome margin of control in that the aircraft will -upon loss of line tension created by one's own wake , turbulence or a wind gust, fly back out; allowing the aircraft to regain line tension in time (hopefully) before disaster strikes .Key is the air spiral created by the pusher around the rudder/vertical fin .
Tractors don't offer a similar outcome . As one would expect, they have the opposite effect upon the air spiral around the rudder/vertical fin, so one is left having to add rudder and/or motor offset ( control-line 101). Plenty of line tension, but not the quite the same...
I know of an electric flyer who flies clockwise and has benefitted from switching back to tractor. Can't say that is a general rule; just worked better for his particular aircraft.