True terp sap is the best when it comes to ingesting or vaping. I am not sure if it is premium when done with BHO, never tried it. I believe the terps would need to be extracted separately then put back into the BHO when finished.
I have come up with a way to do it with an alcohol extract without additional extractions, it only requires patience. I call it Naturally Decarbed Sap or ND Sap. It takes at least 100 days to make it properly, naturally decarb, and contain all of the terpenes. There is a huge difference when compared side by side to RSO. RSO cannot compete with NDSap. If you wish to learn more, google is your friend.