Height
Desktop/mini tripods (under 30cm) suit flat-lay and desk content. Extendable floor tripods (over 1m) suit standing shots and vlogging.
Grip and stability
Check the leg-lock mechanism (twist-lock vs flip-lock) and whether the base is weighted or wide enough not to tip.
Mount type
Universal phone clamps fit most phones, but check the maximum width for larger phones or thick cases.
Extras worth having
A Bluetooth remote shutter and a ring light mount are common on tripods aimed at content creators.