I recently made a deep search on various Gutenberg addons. This one is the best I found for a number of reasons:
This plugin is developed in a very professional manner. It is full of useful blocks but the best part is the edit options are given for each block. I also like that I can switch on or off any block I want.
Another great thing about this plugin is the documentation and the tutorials. Everything is explained, either on their docs and videos, there are on their website or with tooltips while I work on my WP editor.

Very good Job for a Free plugin. I am happy to use it!