From what I've read, autos yield a lot less
My first auto yielded 6.5 oz. The last one I harvested suffered some challenges due to acidic soil. I struggled to keep her going with foliar feeding as I raised the ph of the soil. It did 4 oz.
I like autos for 2 reasons:
1. They move at a faster pace, which keeps things interesting. I get a little bored with photosensitives, waiting, waiting. Autos provide more immediate feedback. Enough so that I don't find myself tapping my foot, getting anxious for things to move on.
2. No "dark" requirement. In other words, I can leave the tent open. I can work on them whenever. I can have a perpetual grow with veg and flower plants side by side (which is what I do in a 2x4 tent, harvesting a plant every 7 weeks.).
I'm seriously considering growing 6 autos in my 4x4 tent after I finish my remaining photosensitive seeds. Harvest a plant every 18 days, add a new seedling.
Downside to autos:
1. Ruderalis must bring some non-high traits to the plant. But, the results of mine have been plenty strong for me and my friends.
2. Lights run 18 hours all the time. Uses more electricity and reduces light lifespan because there's no reduction to 12 hours.
3. Seed bank estimations of time are consistently too short, setting false expectations and perhaps contributing to the perception that autos don't produce much, or aren't potent.
For example, my Northern Storm strain is said to be 65-80 days (9.2-11.4 weeks). I'm havesting at 101-105 days (14.4-15 weeks). I could have switched to pure-water "cleanse" 4-5 weeks earlier, but the buds would have been small and not too sparkly. It's those last 2-3 weeks when the buds get fat and nasty.
There's a lot of good info about autos on autoflower.net.