Default to a single large whiteboard because it feels like the simpler purchase, and a room that actually needed continuous wall-length space can end up needing a second board within a year. A large single whiteboard and a whiteboard wall solve the same need, more writing space, differently, and the right one depends on how the room is actually used, not just its current size. Run that comparison before buying and the choice made now does not need revisiting once the team outgrows it.
