It's not about potency soo much as it is about how you are using them. Sermorelin could be great but it requires a stout dose because of the short active life, not exactly cost effective. Modgrf1-29 is effective at a lower dose combined with a ghrp peptide. I'd personally combine a ghrh with a ghrp, it's not cost effective to run a ghrh on its own. Ghrp on its own is effective though, adding a ghrh only amplifies the effects.