I fish 1/8, 1/4, 3/16, 3/8 heads on tubes from 2.5"-4". The smaller lighter ones get the M and he heavier larger ones get the MH. If I had to go for only one size rod it would be the M because of its versatility. For me good quality rods are a must for this kind of fishing because the bite can be only a slight change in weight which can go unnoticed on a rod that is lacking sensitivity.