iPhone vs Android vs PC (WIFI CONNECTION)

This isn't a “iPhone is better than android” or vice-versa battle but a serious question. I have an issue with wifi connection across multiple iPhones vs 1 android phone I use occasionally vs my laptop.

I have a Samsung Galaxy S4, a 2011 dell laptop, an iPhone 5s and an iPhone 6S+ and my situation is as follows; I can use Snapchat, Instagram, Reddit, Twitter, Imgur, SoundCloud, Spotify and other various wifi/data applications better on both of my iPhones than I can on my laptop or galaxy device — but when it comes to Netflix and YouTube my iPhones lag behind as if they're the ones that are outdated.

This is only a problem on 1 specific wifi connection I noticed but it's such a weird situation that I want to hear what you guys might have to say about it.

Why can my old and outdated galaxy/laptop load and buffer the same videos better on the same connection and same frame rate as my iPhones?

I've also noticed I can be right next to the router with my iPhones and still load video slower and buffer slower than my galaxy and laptop when they're farther away in different rooms across the house. The distance doesn't change anything in this situation.