autoflowing strains give you control, and control is almost everything for an urban, city grower, ie, closet grows, tent grows, and you get buds in less than three months, you can give light 24/0, use cfl's, led's to their advantage (electricity bills) you never have to worry about light leaking or any nonsense with using green lights to tend to the plants.
yes the yield is lower, but not really the thc content. Not anymore. I smoked some autoflower recently that knocked me on my ass.
the down side is the cost of the seeds. You want feminized seeds, you can't clone, so you have to buy seeds. That is the main disadvantage. It costs more, but you have control, and quick turnaround. It's not hard to setup a perpetual grow with auto strains, your cost is the seeds.