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I never said you should use Gentoo. Arch Linux is an awesome system, the original argument was about Gentoo being the most customizable, not the more quickly implemented of the two or the most user-friendly.
Each article clearly explains why Gentoo is more customizable, but anything other than that is just bonus information.
Arch Linux and Gentoo are very similar systems built on the same architecture and with a similar philosophy. Arch Linux can do a lot of what Gentoo can do in a much more user-friendly manner, and that's great. It's very stable, there is no argument about that. However, it is not as adaptable and customizable as Gentoo as the first article on the top of my post explains.
As far as I know, Gentoo is much better to use in the long run if you are willing to go through the terrible Mordor of compiling the entire thing, though there is a command to automatically construct a lot of it.