DC's always felt very childish, apart from the awesomeness of Batman.
never got into the Superman comics, seemed like dull and simplistic stuff at the time.
The Flash was cool, a few great comic battles, some interesting cross-over issues (with other flashes, other villains etc).
GL stuff was very childish.
Takion was cool, sadly it was very difficult to find his comics at my local.
Marvel generally had the better 'character driven' comics. Spiderman was always an interesting read. X Factor was great. Transformers was fun and childish but was intentionally so.
Punisher was one of my fave comics, alongside the Batman comics and the occasional Surfer comic, when the story was involving.
Surfer was occasionally quite good and the character was definitely aimed at teens/early-twenties types, since there was a lot of meditation on metaphysical stuff - in a very superficial way, of course.
Doom was awesom, across the comics he appeared in.
Hulk was, and remains, a great combination of action and character. psychology and plot. definitely was more kiddie-ish back in the early '80s (I remember the garish hardback annuals and stuff 😖).
but Marvel's Heralds and Galactus are disgustingly neglected right now. the stories are more to establish the ascendance of formerly insignificant characters and to appeal to the rising (I guess) kiddy market 😖.
Marvel is/was overall, more adult and interesting.