Yes, they were, a straight WD would pretty well make an M look stupid, both on 3-14s.
But, unhook the SC plow, throw the drawbar back under it, hook onto a 10" wheel disk, or any other tool for working down plowed ground, and the M took the lead.
When I was born, dad had a WD, and an M, WD was for plowing, planting, cultivating, hay, pulled the 60 AllCrop, and where needed on other odd jobs.
The M helped plow, worked down most all of the ground, helped with hay, and carried the 2MH picker, (except when it sank). :)