I've done both, in and out, and IMHO I believe what Matt Rize said to be 100% true. Potency is all genetics, all we can do as growers is provide our plants the best conditions/nutrients to grow them in as we can.
Indoor you get "better looking" product due to perfect temps, humidity, even lighting, smaller crops equal more attention, which equal nicer looking end product.
Outdoor you get MUCH BETTER LIGHTING, but tough to control the temps, humidity, and even lighting.
Greenhouses offer the best of both worlds...You can better regulate the temps and humidity while providing natural sunlight to your crop.
I prefer Greenhouse or outdoor herbs vs. indoor herbs just because that's the way Mother Nature did it...if it's good enough for her, then it's good enough for me!
Okay I lied....weed is like women...I like it ALL, blonde, Brunette, Red Heads, Black hair, Hydro, indoor, outdoor, greenhouse...I like them all!
TMB-