Rockman wrote:5. Better Villains
No contest. Sportsmaster, Klarion, Blockbuster, Bane.... These are relatively unknown characters to non comic fans, done well. But Avengers gives you Loki, Ultron, Kang, Doom, Enchantress, Zemo. The greatest hits of Avengers big bads with no end in sight. I know that we've seen Lex Luthor and other more notable villains on Young justice, but not nearly as much as the other characters.
I'm not watching either show, but other than Doom and Loki I seriously doubt most non-comic fans have heard of those Marvel villains either.