The best thing about Arch Linux is the DIY philosophy it is based upon. With Arch Linux, you've to set up everything yourself. The installation is command-based and post-installation, you'll only be left with a command line. You'll even have to install the desktop yourself.

It is quite customizable. But my favorite thing about Arch is the package management "Pacman", it is very easy to use and straightforward. Another thing to take into account is the documentation, Arch has some very helpful documentation.

Arch is not for everyone, it is for the professionals by the professionals, I loved it's open system architecture and learning curve. Used manjaro which is based on arch, truly amazing experience.