(k)Ubuntu had - when I used it -
- stability problems with KDE,
- broken updates,
- broken upgrades,
- out of date packages
- and the ppa mess to add the software not in the official.
Arch was and is
- rock solid for me,
- updates and upgrades went extremely smooth,
- software packages were more up to date,
- aur had everything I needed
- Archwiki is a great resource of information
I learned a few things on my journey with arch - and with today's installer it's a no-brainer to get arch running with encrypted btrfs layout.
I am happy to have had "the courage" to try arch, after I tried suse, fedora, kubuntu, mint, debian, opensuse and some short-lived experiments with smaller distro like mandriva and names I cannot remember.
The whistleblower is real, the technology from outer space is not