There are a few that are classified as most potent autos; afghan kush Ryder, think different, and auto Mazar come to mind. I personally have not grown them.
I grow photos in a perpetual setup but
I do a summer auto grow each year and I have had good results with sweet seeds. Last summer I did 3 of the cream mandarines and got 13.83 oz dried and cured from them. Nice smoke too. Those were not the only ones I did last year but they stand head and shoulders above the rest.
Another nice one I've had was G-13 labs diesel auto. The first one I had was a freebie and I have ordered it 2 more times since. It has a nice smell while growing, like sprite with a hint of gasoline. Taste was about the same as smell. They yield around 1.5-2 oz each. Good daytime smoke.
I just made my order for this years auto grow and I'm gonna run sweet seeds red poison, pineapple punch from auto seeds, and automaria 2 from paradise. I always have something from sweet in each order. Price and quality all in one
Good luck in your quest.
I hope it works out perfectly for you.
Polo