Seriously, there is really no such thing as a best anime. Because there are so many different genres and even some of the best anime have some sort of flaw that can make you dislike that particular part of them. Take for example Evangelion. There are lots of fans for it, and the majority of them hate the main character, Shinji's guts.
I believe there never will be a single anime that is truly better than all others. Similar to how there will never be a single AMV that is truly better than all the others.

