On my website, I still have the old AdSense ads I've had for many years, in addition to Auto Ads turned on. I notice in my stats that Auto Ads get many more clicks, have a higher impression RPM, and a greater percentage of Active Viewable Area than my older AdSense ads that I've placed.
Have you gotten rid of your old ads, and use Auto Ads only?
Love to hear your thoughts and how it's worked for you.