I've actually finally done it haha. I have gone against my premise in some ways and omitted certain ones that are more favourable in place for what I deem more important moments. I've also broken them down by film and easily could have done a top 20.
Man of Steel
1) First Flight - This is the standout moment in the entire DCEU for me, it's just a amazing.
2) The Battle of Smallville - the greatest superhero fight in cinema history,
3) Superman destroys the World Engine - on a personal list I had Escape from Black Zero over this but this moment is more important. It's such an incredible moment, vastly underrated too.
Batman v Superman: Dawn of Justice
4) Enter the Bat - the best Batman introduction scene ever, it was like something from a horror film
5) Warehouse Fight - One of the greatest superhero cinema fight scenes ever and certainly the best involving Batman.
6) The Trinity stand together - I was gonna go for the Wonder Woman debut moment but this moment slightly after is more important.
7) Superman's sacrifice - I think this will end up been the mist important moment in the entire DCEU post Justice League.
Suicide Squad
8) The birth of Harley Quinn - this is my single favourite moment from the film, they really did it justice. The way she falls into the VAT of chemicals then the Joker leaps in after her. It was like something from the comics.
Wonder Woman
9) Diana's training in Themyscyra, I loved every part on Themyscyra but the training montage of Diana taking on the other Amazons and Antiope losing it with her. Then Diana clashes those bracelets together for the first time. Just wow!
10) No Man's Land - this will probably be on everyone's lists, it's the moment Diana becomes Wonder Woman. It's such a perfect moment.