Whonix is, as is made clear in other summaries, intended to be run in a virtual machine.
Whonix on windows or debian is okay. While whonix makes tor much safer, it bears all the bugs from its version with debian on top of the bugs and quirks of your hypervisor. Combining it with snapshots or images will allow you to revert back to a clean version periodically, keeping you more secure from malware that persist from an earlier session.
It obviously includes the tor browser, but also generic firefox and chromium. Its also packaged with programs like the IRC client Hexchat configured for tor and Libreoffice applications for document editing.
QubeOS users get the most out of whonix, since disposable Vm's and running your updates through the whonix gateway is easy. You simply arrange the network of your non-whonix vms to be under the whonix gateway (whonix-gw).
If you use tor and dont need direct access to the files of your browser, its worth trying out.