I have to say that I did like XP better than any other OS. Back in the good old days when I was running FS 2004 I felt the quality was better. The aircraft seemed do have more bells and whistles.. I was really into tubeliners and there were some great sound effects, especially with the airbus collection. I reluctantly went to Win7 and it was just OK in my book.
I am not a fan of Windows 10 in any manner. My wife has one desktop, a surface pro and a laptop all with Win 10. I can't get used to it and she fights with all of them on occasion. Since I went back to FSX SP2 on Win7 64-Bit I am a happy camper. Scenery looks better, frame rates are better and since I have an SSD it loads in less than 20-seconds. Beats the heck out of Steam edition. So I'm staying with Win7 as long as I can.. I don't think I'll be going to FS-2020 since I hear it will be subscription and only runs on win10. What say ye?