Earlier quoted context omitted.
Debian is just as quick, and does not have the problematic "rolling" updates of Arch. (It does have the "testing" and "unstable" channels which are roughly comparable, but the Debian folks won't tell you to use them in production.)
Debian is not just as quick (significantly slower and higher resource usage), but Arch isn't all that fast nowadays, either.
In which respects? Are you talking about apt vs pacman or something? Default DEs?