I actually just finished my first two grows. One was indoors and one was outdoors. I had differing levels of success. I got way more weed from the outdoor grow, but the quality was kind of questionable. The indoor grow had lower yields, but was faster and the bud quality is far better.
I do think it would have increased my indoor yields a lot if I had done more training in the vegetative stage and gave them a bit longer before flipping to 12/12. I didn't really realize the important of canopy coverage until my plants were already flowering and I saw all the empty spots in the tent without any buds.