I have a iPhone 6s which should i upgrade to a XS max or 8 plus?

I see way too many people with the XR and it annoys me so i want something from everyone else

The xs is the best hands down that chip/camera/display/design is priceless

If you parents agree, then go ahead. Nicer phones may give more issues later on.

XS Max if you can afford it
8 Plus otherwise

XR as a good middle ground (which likely explains why so many have it)

If you are really annoyed by such trivial nonsense as what phones other people carry, then there's very little hope that you will ever reach adulthood. Get over yourself.