Your H has a bit of a hp advantage on the JD M. The Farmall equivalent of the JD M would be a model C. They are all fairly close however and would all be considered "2-plow" tractors. The H has just about perfect hp for the 5 ft cutter and I have used that combo several times and it really worked great (a nieghbor had one). I do think that JD M will also do fine on a 5-footer.