If we're referencing hazes and mostly sativas, I'd say the potency outdoors is on a whole 'nother level. I've yet to smoke a Neville's Haze and real Skunk #1 grown indoors that beat the UV rays from the sun. Those varieties are seriously like mild mushroom trips when grown outdoors.
Indicas, autos, and hybrids outdoors are, however, on equal ground.