Since they are basically by the same manufacturer, the only diffference I can perceive is that for instance the 2/3 wt which usually tended to be closer to a 3 wt, where in these blanks they run more true to the weight designations and they are not multiweight designated. If you want a 3wt get the 3wt, if you want a 4wt, get the 4wt. They will handle overlineing, but it is not necessary.