Firstly and most obviously, this is going to trigger an immediate and passionate response in the form of a full ("insufferably long") article of ten greatest gangster films. I've been meaning to write one for a while, and this article makes it all the more urgent.
Secondly, these are all good choices. I consider Casino a lesser beast than Goodfellas, but it still has some remarkable moments. As for The Irishman, I thought that was stunning when I saw it in the cinema back in 2019, but I've not seen it since. I really must pick up a Blu Ray of it.