I can say with the utmost confidence that there is,and never will be "a Holy Grail" of herb. There is no one strain that will be "far and above" anyother strain,imo.
Someone mentioned Kush, for instance. Now, the Kush I grow could be swag compared to someone elses grow of the EXACT same strain.
That goes for any and all strains, imo.
For example. I have been working with Hindu Skunk for about a year now. The finished herb from day one to my last harvest last week would show quite a big difference in quality. The herb finshed last week is just plain FIRE.
The months before, it was "OK".
I could give Perfect clones of the same strain to 10 friends, and it will turn out a bit different.
So, all said and done, the best herb is allways the herb grown to full potential and full term. Strain is the least factor in Good herb.