Sophisticated projection methods create high quality UVs:

1. Oriented. UVs are aligned with the object's up axis by default. Ideal for directional textures e.g. bricks, tiles, wood, leaks etc.
2. Stable. Unlike other procedural UV solutions, the projections are stable by default and if left unpacked, don't jump around as you change your model.
3. Automatic and manual. All projection types are available as modifiers and tools. UVs can be created in real-time as you model, or you can use the tools directly in edit mode for fast manual UV unwrapping.