Im not a senior grower so I couldn't give you a real good answer on that but personally I would say seed, but I know that Dr Greenthumbs beans are fairly expensive so you could do cuts also, just my input man lol :p
I think you may want to wait until Cali Connection restocks if you want some of that OG. I'm not knocking Dr. Greenthumb ( I have Esky) but it seems from the grow reports and smoke reports listed on the farm that CC is the way to go. I know I am!
D.B you seem to have excellent taste when it comes to strains. They say endless sky is their strongest strain.I know it won the cup one year.When u grew it did it live up to the hype?