It'd be really interesting to see a performance analysis of what's going on there. Is it just a weaker CPU or are the apps less optimised as well? The two phones were comparable right up to the time they loaded a game and it just fell behind further and further from that point on. Why is loading that particular game so much slower? The developers didn't care to optimise it?
edit: The article points out that the resolution of the Samsung display is a lot higher, so it's not quite comparing apples and oranges here. I'm guessing that a much higher resolution is pure win when drawing mostly vector graphics i.e. apps but really kills you when loading games as presumably they're paging in much larger assets from disk.
Well for starters, Anandtech measured the NAND performance of the 6s as significantly faster than the Note7; 1.65x faster sequential 256k and 1.15x faster random 4K.
I doubt the assets are different, that would require the developer to include different assets for various different Android screen resolutions for different phones in the Android version of the app. Rather it's the dynamic drawing engine that will be doing more work generating the screen images at the higher fidelity because that will work at the screen's physical resolution.
edit: The article points out that the resolution of the Samsung display is a lot higher, so it's not quite comparing apples and oranges here. I'm guessing that a much higher resolution is pure win when drawing mostly vector graphics i.e. apps but really kills you when loading games as presumably they're paging in much larger assets from disk.