in my opinion i think equi is a bit stronger than primo so it takes a higher dose of primo to match up with equi. equi. will increase your appitite and does require a high calorie diet for maximum results. Primo doesnt seem to effect appitite one way or the other and does not require a high calorie diet for optimum results. SO primo would def. be a better choice for cutting up and equi. would be better for strength and weight gain.