Needless to say, this is one of the best shows i've seen, ever, if not THE best. It doesn't make sense, it's completely ridiculous, but that's it's charm, and along the way it's genuinely heart warming and sad to watch. It's not there to answer a deep question, it's simply about a group of friends trying fighting to live in peace, and growing up along the way.
The characters are amazing, the animation is fantastic, and every episode reaches new heights, going bigger and louder with each scene, all which ends in maybe the most insane ending sequence that i've ever had the pleasure of watching.
Regardless of which edition you buy, it deserves to be on your shelf, and in your life and memories.