Top 3:
Marvel U: Mainly because it somehow seems there isn't major civilian casualties compared to DC when there is a superhero/villain showdown + Nice alien cities to visit
Walking Dead: First things first they have down right the easiest zombies to control. Secondly had a dream where I used a helicopter to send all zombies down the Grand Canyon (noise herding them there) and made Vegas more livable.
Any universe most likely to destroy the US: I might sound like I hate them (Just a little tho and its the people) but in most (if not all) movies they attract anything bad (aliens, start zombie viruses, godzillas) which in reality is incorrect but due to patriotic directors they always seem to do so. I understand Hollywood is in America but is all that patrioism necessary?? Though would like the destructor/s to get destroyed in the process.