I’m afraid I only tried the red Sumatra first and then moved to the FS Gold. The Sumatra is noticeably weaker (but not in any way ineffective or ‘dead’) but definitely still with that opiate-y buzz. The great thing about KuK is that they answer any queries pretty promptly and will be able to advise you knowledgeably if you drop em an email giving as much info as you can re your requirements. Ive tried bits and bobs of other Kratom from different sources- very broadly speaking & in my limited