Wombat!
I see that you are an avid flight sim user. Am I correct in presuming that you are not a novice when it comes to using a PC?
If you have not already seen these, I might suggest that you read the posts. They are aimed at beginners, but they can be helpful to experienced Windows users, as well.
https://www.bleepingcomputer.com/forums/t/577719/never-tried-linux-before-read-this/
https://www.bleepingcomputer.com/forums/t/785322/how-to-test-drive-linux/
My personal preference for Linux is Xubuntu. It comes with all the basic tools, such as Open Office, a web browser, and a media player. It uses the xfce desktop, with a default simple pull down menu. I "modify" the installation to my needs, by adding some additional software.
Open Office will allow you to read and edit all your MS-Office documents, such as *.doc and *.docx files. It will also save in MS-Office format, as well.
I still use Windows, installed as a virtual machine, using Xubuntu as the host. I have a copy of AutoCAD 2000, that runs fine under Wine, (which simulates a Windows environment in Linux.)
However, AutoCAD needs a native Windows environment to plot properly. So, every once in a blue moon, when I have a new project, I do the drawings using AutoCAD through Wine, and then open the VM to plot them to CutePDF, so I can print them from Xubuntu.
I mention this, because you may want to try running MS-Flight Simulator through Wine, or as a VM. It saves having to re-boot when you wish to go Ad Astra.
Regardless, I suggest you try a few different distributions of Linux before settling on a permanent one.
I think that the main criteria you should consider is support. The more popular a distribution is, the more likely it is to have a wide support base in the forums.
Cheers!
Naught.