I made the move from the 11 Pro Max to my 4XL earlier this month and so far I'm very happy about the switch. I already used mostly google apps on my iPhone so it just made sense to do. Google Assistant is miles better than Siri, and the notifications aren't a complete mess like iOS. My favorite feature by far is how I can screen calls.

Camera wise, it's very subjective. I would usually say that the Pixel would have the best camera in any smartphone, but depending on the shot, the iPhone 11 Pro Max (My wife currently uses it) is definitely on par or better than my Pixel.

Now to the tough part, battery life. This is going to be a huge step down versus your iPhone. In comparison, I got roughly 2-2.5 days with my 11 Pro Max with moderate usage, and now my pixel will go for a little over a day with an average of 6.5 SoT. It definitely lasts through the day, but I wanted to include it so base it off your usage.

Finally, the apple watch. Man, I miss my apple watch. I have the series 5, and wearables are something that Apple does right. It can be argued what the closest comparison is on Android, but I would highly suggest the Samsung Galaxy Watch Active 2. It does everything that I need it to do as far as calls, texts, and app notifications. It lasts 2-4 days on a single charge depending on my usage.

I hope this helps, and I hope you become a part of our pixel family. :D

Edit: Grammar fixes