what is linux best for
Which os is best will always receive mixed input.
Even worse so with linux because Linux is a generalized term and there are many distros for many different purposes.
That being said, linux is capable of running pretty much anything now, except very specific products.
Alot of those products have alternatives made for linux.
Linux runs better and more efficiently than windows except when running windows native applications.
Sadly, most games are written natively for windows, not for linux.
However steam has made a compatibility layer that works, but it sacrifices 10-20% of performance, so thats that. It works nicely though. If your computer can handle it sure, but on lower end hardware that is all you need and the framerate is unplayable.
Heavily modified/stripped windows versions are certainly a liable alternative to linux if your main focus is low spec gaming.
Windows AME is good, and I believe a newer project is coming along soon to replace it.
If privacy is a concern linux is a very good option, if not the only option.
IN alot of cases, for everyday use, certain linux distros will achieve a performance level simply not possible with windows.
Gaming still is windows king though, unless you have nicer hardware and/or are willing to sacrifice some performance.