Joseph Rézeau

Thanks for  this detailed & useful comparison, Oliver.

1. "Being able to copy existing H5P content and paste it to create a clone of the exercise or to include in as subcontent in other content types is not possible on moodle's integration for some reason."

It's still possible to do that, but in a more convoluted way than the "normal" one. Here is a comparison:

with the H5P plugin

1. view existing content "H5P my exercise"
2. click Reuse
3. Select Copy content
4. Add content
5. Interactive content
6. Under the "Select content type" title, from Create Content / Upload / Paste select Paste
7. ... et voila!

with the H5P integrated activity

1. In the Content bank
2. Select and Edit an existing content "H5P my exercise"
3. At the top right, click the Copy (Copy H5P content to the clipboard) button
4. Exit content "H5P my exercise"
5. In the content bank, click the Add button and from the dropdown list choose any content type, I suggest the very first one, which usually is Accordion
6. In Edit mode for Accordion, Click the Paste and replace button in the top right corner
7. ... et voila!

2.- "A feature that I think is not yet supported in moodle's core integration is resuming tasks - called "save content state" in the options of the H5P plugin where it can be activated."

That's correct, and IMHO this is a pity, since the "save content state" option is a vital feature for those H5P activities which should allow the student to quit an un-finished state and come back to it later on, e.g. Dialog Cards.

3.- "The moodle core integration is more versatile when it comes to integration with moodle's gradebook." Yes, that is a strong point of the core integration. The integrated H5P activity also allows more detailed attempts results to be displayed, when several attempts are allowed.

4.- IMHO, in order to avoid confusion in the end-user (teacher) a Moodle site admin should probably not enable both the H5P plugin and the integrated H5P activity on a Moodle site.