But if Ubuntu is easier, why not use Ubuntu?
But if Ubuntu is easier, why not use Ubuntu?
If you are not a power user and Ubuntu likes your hardware then Ubuntu is easier. If you need to mess with things in /etc then you hit its roadblocks quickly.
Ease to use is not the only thing mater for everyone, and having something powerful, more customizable, more understandable, those kind of things mater to some persons.
But what is the advantage of Arch over Ubuntu? They are both Linux... My question was serious, I really don't know why I should prefer Arch.
Your question, now, is a much more open one, then more difficult to answer. This page try to explain the Arch Way https://wiki.archlinux.org/index.php/The_Arch_Way
I wrote something that tried to explain why AUR is an important part of Arch Linux http://www.nicosphere.net/why-aur-is-part-of-the-arch-linux-...
Simplicity of use, packaging, configuration, understanding. No default choices as Unity, it's light and fast, a great distro to learn from, great community and documentation, and much more, that make Arch a great distribution widely used.
Also keep in mind that to a large degree these things are a matter of preference. I like Arch's package manager over Debian's. Things like that have pros and cons, but on some level it breaks down to simple preference.