It depends on personal preference. Some people might like Marvel superheroes more for their diverse powers and relatable characters. Others might prefer DC superheroes for their classic and iconic status.
The duration of the Lego Marvel Superheroes 2 story really depends on your playing style. If you rush through, it could be shorter, but if you take your time and do all the side quests and explore thoroughly, it could easily be 20 hours or more.
The way to view comics in Lego Marvel Superheroes 2 depends. Sometimes you need to progress through the game to unlock the feature. Once unlocked, look for a dedicated comics section, maybe in the settings or story mode menu.
Lego's Bionicle series, which has a science fiction vibe, is also amazing. It has unique robotic - like creatures with lots of movable parts. The story behind Bionicle adds to its charm as well, making it a great addition to Lego science fiction.
DC Comics has a vast array of superheroes. There are so many that it's almost impossible to put a specific number on it. However, it's safe to say there are many hundreds, each with their own unique powers and storylines.