Miro is the most complete online whiteboard: infinite canvas, workshop facilitation tools, voting, timers and thousands of templates, plus diagramming and lightweight docs. Integrations bring tickets and designs onto the board so planning happens next to the actual work.
It suits distributed teams that run workshops, brainstorms and planning remotely. Big boards get heavy, and per-member pricing means casual participants still cost money at scale — teams already in Figma often just use FigJam.