It's free, it's efficient, it's technologically superior, it's fast, and it is simply awesome!
There are many benefits to using Linux, both practically and ideologically. Practically, you get an open development model, which means that bugs and flaws in the software don't usually stick around long, and that makes Linux very stable and reliable. It's also free, which means that whether you're a consumer or an enterprise, adoption is easy and costless! And the open development model contributes to innovation and creativity since there is no fear of losing money, and that allows for amazing, unique and new programs.
Ideologically, you're supporting a movement to a democratic, honest paradigm of computing, which is better for everyone. A paradigm that bases value not on how much money a program is gonna make but on how it contributes to the greater good and freedom of everyone! That makes Linux nothing but a win-win in my book!