Arch is less annoying than Gentoo when it comes to package management. I don't say that lightly. I think that the power of emerge is quite respectable. I like that Gentoo gives me a lot of control over package builds and whatnot. I also like the endless tweaking abilities of Gentoo. However, the Gentoo repos are marred by package masking that gets ingratiatingly annoying. I think that Arch has a great balance between power and ease of use... especially in comparison to Gentoo.
Honestly though, I prefer Slackware.