It depends on whether 'installing' only means the installation or the installation and configuration of hardware. Because once you have installed Arch, configuration is probably easier on the average machine due to wider hardware support.

It's been a while since I installed NetBSD, but the last time, on-board sound wouldn't work without kernel driver patches. And hardware-accelerated OpenGL on a modern GPU was unsupported.

(That said, I used NetBSD as my desktop OS besides Slackware Linux from ~2001-~2005, and it is an exceptionally clean and nice Unix.)