But just about no one is using anything but the latest version of Chrome. Here's a look at how browsers handle their updates differently and how that affects user share.
Windows has one default window manager, the poorly named Explorer, which you only really notice if your browser locks up, you go into Task Manager and dump it thinking it's Internet Explorer (which is a browser) or Windows Explorer (which is a file manager), then find your desktop doesn't work at all.
Linux gives you multiple options. I've mostly used just two: the bells and whistles Gnome and the minimalist Fluxbox. But for the truly geeky here's a list of hundreds. Overkill? Sure, but you know I'm all about that.