What's the difference between a cross-line, 360-degree, and rotary laser level?

A cross-line laser projects one horizontal and one vertical line on a wall, ideal for picture hanging, tile, and short framing layouts. A 360-degree (multi-plane) laser wraps lines fully around a room, which trade reviewers say is what you want for whole-room framing, ceiling grids, and electrical layout. A rotary laser spins a single point at high speed to cover much longer distances (often 1,000+ feet with a receiver) and is the consensus pick for grading, foundations, and exterior work.