Your decision would be easy for me. I’m opposite of you. I have a iPhone and debating note 10+. If it was any other phone the iPhone is a no brainer. If the note series didn’t exist I wouldn’t own any other android phone. And it iPhone had a pen or stylus and better multitasking I would be there in a heartbeat, especially given the battery life I get on a pro Max.
Sadly, the only Android phones that I have any interest in are the Pixel and OnePlus, but I'm not impressed with the camera on the OnePlus. I have had warranty issues with every generation of the Pixels so I'm thinking the P4 won't happen at this point. Battery life is a major item for me as well, the P3 is severely lacking in that department.