HI! I'm a high-schooler (so the target audience) and I've done both the intro/in-depth fellowships. Often the fellowships required me to digest a lot of unfamiliar information and big words which became quite overwhelming for a teenager new to EA.
However, in my opinion, non trivial is far more accessible and digestible in subtly teaching EA principles to my age group. I also love the UI. I really think the team have done a great job :)