The biggest difference is how they use desk space
A traditional stand puts its base on the desktop. A monitor arm moves the support point to a clamp or grommet, which can free the area directly below the display.
Arms usually offer more positioning flexibility
An adjustable arm can make it easier to change screen height, depth and angle. A good factory stand may still provide enough adjustment for a workstation that rarely changes.
A stand is simpler to install
The original monitor stand normally needs no desk compatibility checks. An arm requires a suitable desk edge or grommet, enough clearance and a VESA-compatible display.
Heavy and ultrawide monitors need extra care
Large displays put more load on the mount and desktop. Verify the arm rating and desk suitability rather than choosing only by screen size.
Which approach fits your workspace?
Choose an arm when desk space and flexible positioning are priorities. Keep a traditional stand when simplicity, easy relocation or desk-mounting limitations matter more.