reading the post is ocures to me that maybe we arn't being quite fair to the old machines,a lot of varriables can interfere with these choises, like operator experience, ground conditions and weather the tractor itself is of the proper type and horsepower for the job its being asked to do, ie, if you have a old jd or farmall diesel tractor and you measure snow in feet not inches you may have cold starting problems in winter, that doesnt make it a bad tractor, or if you have a N series ford and your trying to pull 3 16's thru clay it aint happening, that doesnt make the ford a bad tractor, so lets limit the tractors to antiques made before 1970, and group them say light duty- N series fords, allis b's, and c's, farmall cub, a's and b's ect then 30 to 50 hp, then 50 to 75hp ect now lets try this again for the best and worst and what it was doing that made you choose that model for nomination , i know i cant spell, just makin talk about tractors