I'm really curious about this statement. What makes stock Android so much better/more advanced than iOS?
I flirted with a Pixel 3XL earlier this year, and I thought it was pretty decent overall, but I didn't necessarily feel either OS was so much better than the other. So Im definitely interested to learn more about this before the next round of new flagships are released this fall.
For me, Android is just smarter and does more. Also, notifications are much better on Android. You have more control over what you can do in Android so you can tweak to your visual liking or even more settings in general.
The big advantages of iOS (for me anyways) are the apps in general are more polished on iOS. Heck, some of the Google apps even look/perform better on iOS which is mind boggling. And if get overwhelmed with options or tinkering then iOS is a good option. You can't customize a ton so it's a "set it and forget it" type of situation. Some people desire this.
Me, I love both Android and iOS so I'll be getting an iPhone XI and a Pixel 4 XL. As a result of this I may also be getting a divorce.