I’m using Arch because you start with nothing and you can make any system you want. I have disk encryption, btrfs as a filesystem, secure boot with my own custom keys, I’m running self-build kernel, I’m using apparmor and I can use any program from AUR, etc. Thats my personality. Things that you can’t see but are important to me.
On other distros some of these things would be very hard to do. Especially without Arch Wiki.