Hello Christoph Mosimann,
As was mentioned below, the FullFly package owners have access to all plugins released till April 20, 2020,
it means that you can use 42 premium plugins in fact.
Now if you'd like to compare these two licenses let's make more objective calculations:
without the script and template cost you have access to premium plugins whose total cost is far behind 600 USD. You can check it yourself:
https://www.flynax.com/plugins/category/premium.html
and I don't think that you use only 3-5 premium plugins on your site where at least 8 plugins are required for working site as they are most used:
https://www.flynax.com/plugins/categ...ort_by=popular