I use my iphone 17 (100% health/87 cycle) and brand new Pixel 10 pro (100% health/15 cycle) in the morning for general scrolling, 10 -20 minutes on each device.
iPhone battery percentage typically does not change, while P10p usually drop 3 to 5 percent.
Similar thing overnight, iPhone stays drops 1 to 2%, while pixel drops 6-7%.
I dunno if i have a defective battery or just they way phones estimate battery life. Maybe iphone is lying to make users feel good?