DCU: Legacies (2010-) #6
First off, I have not really been into the backup stories (to be fair, it can be hard to tell an engaging story with so few pages), but the Legion of Super Heroes one was brilliant, I love how it poked fun of the mess that their continuity and constant reboots have become.
As for the rest, really enjoyed the main story. The Legends event is one of my favorites, not just for the story (which was one of the better of the early DC event series) but it because it gave birth to so many of the concepts and character directions of the era I love the most. Especially the Justice League soon to be called International. It was in a lot of ways where the post-crisis era truly got going, and as that is what I consider “My era” I can’t help but love the series. So I loved their take on it. Topped off with an amazing and hilarious backstory. Just a great issue, best of the series since the first issue.