that make Vertex Tools 2 worth buying (i.e., “what’s better about it compared to free tools or older versions”), I can help with that. Vertex Tools 2 is a popular SketchUp extension for advanced vertex/edge editing. Its key features include:

Move vertices in 3D space with high precision.

Upgrading to the full version of Vertex Tools 2 offers several advantages over free alternatives or relying solely on default SketchUp tools. 1. Superior Organic Modeling Capabilities

You cannot find a better key than the one supplied by the developer. Here is the official process to get the best possible license: