7 is a remake of Vista, 8 was kinda a new idea that they ran with, 8.1 is the touch screen version... 10 is bringing back the 7 and previous versions with the start/task bar and what not that isnt on 8 or 8.1... all windows phones now are running 8.1, for obvious reasons... they can upgrade to 10 tho, but not for a while after the PC's get it from what ive heard....

im sticking with 7, 8 sucks, 8.1 sucks even more, and i dont feel like screwing with things that they havent gotten the bugs worked out of yet...

if you want a fun reliable OS to mess with, i suggest Ubuntu or Kali, both Linux platforms, but can get tricky installing things because its nowhere near what you are used to with Windows, you need to know a little about computers to do so...

7 and my phone work fine for me....