Should you use Linux or GNU/Linux is up for eternal debate. Although name should not matter but it is important to know what it means.

Linux used to be a kernel, not a full-featured OS created by Linus Torvalds. At the time GNU foundation was working on GNU Hurd, an ambitious micro-kernel but it was still in development. So, to make things roll out faster GNU adopted the Linux kernel and build on top of it the whole operating system and there were other foundations involved. In 1992, the Yggdrasil project chose the name “Yggdrasil Linux/GNU/X” for its combination of software. 
But finally, we settled for GNU/Linux because it is easier to say than "Yggdrasil Linux/GNU/X", but to say "Linux" was even easier.

Now we use the term "Linux" for the whole operating system which would be inaccurate but its easier that way for newbies. Imagine if other operating systems were named like this NT/Window, Darwin/MacOs, sounds cool but unusable in daily usage.