You should try Elementary OS -- https://elementary.io/ -- very stable, free app store (pay what you want, now so basically still free), beautiful UI that resembles Mac OSX and a bit like Windows. I have been using it since version 0.2 (coming up on .5 now, I believe.) Try it as a live ISO and I think you'd like it. There are lots of apps that are cross platform. Steam installs great and more than half my library from Windows works on it!