Auto's are great outdoors for many people with short growing seasons. But when you can manipulate the environment indoors you're better off just growing photoperiod. There are exceptions as some do perpetual grows in one tent, toss one in the veg tent, etc... But if you're just running one crop at a time photoperiods are the way to go. More control. Auto's are not really auto except for initiating flower without concern for daylight hours. That's of no benefit when you're growing indoors with a light on a timer that takes a few seconds to switch to 12/12 to put the plant in flowering mode.
Better genetics with photoperiod plants. Some will disagree but I'm not even going to argue the point.