Not a Marvel vs. DC thread lets not go there.
I will share my Marvel favorites though just to be nice.
I prefer the X-Men from before the last Age of Apocalypse which really killed all things X-Men for me. I hate Wolverine and I can't stand how popular that douche is. The coolest X-Men are clearly Cyclops, Shadow Cat, Iceman, The Beast, Phoenix, Jean Grey, Nightcrawler, and Gambit, all others are useless.
other Marvel books/characters I think are cool
Spider-Man, but I stopped reading during the clone **** and never looked back.
Transformers G1, it was a little bumpy for a while but it picked up by the end. Then they let go of the license.
Fantastic Four, the only super hero group in the Marvel universe not made up of Xavier followers that I like.
All other comics worth reading are neither Marvel nor DC so there.
DC gets big points for Batman though, all incarnations of the Dark Knight rock so no complaints there. Iron Man is a doofus, Hulk is lame, Ghost Rider is just a knock off of that other guy, Avengers is their dumping ground for worthless heroes who can't hold a book together on their own. captain America is about fifty years out of touch, and what else is there... Thor, a cheap, watered down imitation of a really classic mythological character whose stories are timeless?
Obviously these are my opinions but feel free to take them as facts, or guidelines or just to disagree if you wish.