Stock Android and Verified Apps - how well do they play

I have seen thru sites such as Chigz Tech that certain stock Android devices don’t play well with Netflix, Disney or Prime. How well do they play other verified apps such as TUBI, Pluto, Free Vee, Roku Channel, etc.
What should I look for in Stock Android to best play verified apps?
Are 3rd party apps a problem? Stremio, IPTV, Smart Tube etc.

Thanx in advance for sharing!