I like lots of others (The Batman is probably top for my DC pick), but X-men will always hold a special place in my heart. We had a big group that played X-men at recess. The only cartoon that beats it in my mind is '80s She-Ra, but I tend to think of her more as a fantasy hero than a super hero.
Batman: The Animated Series
Batman: The New Adventures
Batman Beyond
Superman: The Animated Series
Justice League: Unlimited
X-Men
The Dark Knight Trilogy
Wonder Woman (2017)
JOKER (2019)
For me Batman: The Animated Series is the best there has ever been. I also loved Superman: The Animated Series, Batman Beyond, and Justice League Unlimited.
Batman TAS
Justice League Unlimited
Superman TAS
X-Men (90’s)
Spider-Man (90’s version)
Young Justice
Green Lantern TAS
Justice League
Beware The Batman