1. It depends on what you value =). For some, those 2 you mentioned are enough. For others, it can be something like the our CLI doesn't require a chromium browser to render SVGs (https://news.ycombinator.com/item?id=31275754). It doesn't cover every difference, but we made a little comparison site if it helps: https://text-to-diagram.com
2. I'm not trying to advertise our paid product in this post about the open source product, but since you mentioned it, we make an IDE that adds the ability to lock in positions and dimensions: https://docs.terrastruct.com/tour/freehand
By the way, it looks like the MermaidJS implementation of the WiiU example is broken due to subgraphs not creating namespaces. That is, the `rom` node in the `amd` subgraph is overwriting the one in the `ibm` subgraph.
2. I'm not trying to advertise our paid product in this post about the open source product, but since you mentioned it, we make an IDE that adds the ability to lock in positions and dimensions: https://docs.terrastruct.com/tour/freehand