I have both loaded all i have to do is shoot a groundhog and see. Last year I shot several with the v-max and they didn't stand a chance. I've heard that the varmint grenades are very explosive, maybe too explosive, they might disinigrate on a wet blade of grass on its way to the groundhog. I'll check back in a couple weeks after I can get out and plug a few groundhogs, then ii;ll give you the field report. But if i had to chose right now i would go with the v-max they are a little more durable for the thicker skinned groundhogs.