More surface in the same footprint
Corner desks use a return to give noticeably more usable surface than a straight desk occupying the same floor area. Available in the Impulse range with cantilever, panel end or cable managed legs.
Who actually needs one
Anyone working across more than a screen and a keyboard: paperwork, drawings, samples, or a second monitor plus reference material. The return gives somewhere to put the work that is not in front of you.
Someone working purely from a laptop and one screen does not need it, and a straight desk will lay out better in the room.
Check the handing before you order
Corner desks come in left and right hand versions. Which one you need depends on which way the return runs against your wall, and a desk of the wrong handing cannot be corrected by rotating it.
Work it out on the floor plan, and count carefully if you are ordering a mix.
The layout cost
Corner desks do not line up in banks the way rectangles do, so a floor of them uses space less efficiently overall even though each one gives its user more. For dense open plan, straight or bench desking will fit more people.
Related shapes: crescent desks for a curved front edge.