The biggest thing I look for (besides size/weight & adjustability) is whether there's a simple disconnect to the monitor.

Moving the mount to a new desk is easy when you can just pop off the monitor!!

An example here. You can find cheaper ones for sure, this one just clearly shows ehat I'm mentioning:

https://www.amazon.com/Mount-MI-35114S-Adjustable-Articulating-Compatible/dp/B00CTBI08C/