ACF Extended – Blocks vs Flexible Content

Using the ACF Extended plugin, what are the pros and cons of using Dynamic Block Types vs Dynamic Flexible Content?

Some points of comparison I would like considered:

  1. Ease of inputting data
  2. Previewing the component inside the back-end
  3. Wrestling with Gutenberg to get it to do what I want it to
  4. Gutenberg as a viable system in the future (I’ve heard some opinions on the negative side)

So far I’ve only used the base ACF Pro plugin w/ flexible content, but I’m wondering if I should invest time in Blocks.

Btw I’m not a theme author, I just develop custom websites.