i told you i would get shit from someone! lol
it also depends on the flowering period too. im not sure if this guy want to wait 12 weeks to harvest an indoor crop, im assuming. if you going for an 8 week cycle and you vegg them for the same time the indica will more than likely outyield the sativa! i guess im assuming things though!
but i know email is a smart guy and knows what he talking about for sure! i could be wrong, im just saying my 2 cents. i have a limited hands on experience with pot, but they dont commercially grow pure sativias for a reason, and its not because it gives a bad high!!!
edit- commercially grown- meaning large scale indoors! also i shouldnt say they DONT commercially grow sativas, but ive never heard of it!