Best childhood superhero would have to be Aquaman. Heck I learned how to swim because of mimicing him. Some of my best childhood memories are in the pool we had doing the aquaman swim, and diving to save lost pennies in the deep end.
The best superhero movie is a close tie between Tim Burton Batman, and Richard Donner Superman. I would have to go superman just because of one line exchaged between Lois and Superman at their first meeting. Superman goes I\'ve got you, and Lois\'s response is you\'ve got me. Who\'s got you?!? My how I love that line.