by ufo6000 » Fri Feb 08, 2019 3:27 pm
The link you provided lists 2 images:
ArchLinuxARM-rpi-2-latest.tar.gz
ArchLinuxARM-rpi-3-latest.tar.gz
Both are suitable for the rpi3 and rpi3+.
The difference is: the first one will install an armv7l system, the 2nd one an aarch64.
The 1st one is the recommended one for now.