In the Istituto Majorana site I found a very interesting post about 27 good reasons to leave Microsoft Windows and use only a Linux distribution.
To be honest I don't think Linux is the good choice for everyone because there are still applications without a good free alternative (Autocad, Photoshop, etc.) and there are too few games... but for someone who needs to navigate on Internet, write documents, play with music and videos Linux Mint and Ubuntu are a very good choice (maybe the best!)
See you!