I honestly can't give an opinion, usually AnimeFEST is my absolute favorite convention, but they moved locations this year, and tried to implement a bunch of new stuff, and had a lot of difficulties, so it kinda made it so-so, but once they get things all figured out I'm sure it'll go back to being great.
As for A-kon, it's usually a so-so convention for me, but since they're changing locations next year, it has the potential to be freaking amazing, as the location was what made it so-so for me for many reasons.
Prior to this year, I would say go to AnimeFEST instead of A-kon, but after this year, they're about even, and we'll have to see how things go next year before I could honestly say which one I like better.
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Friday: Usagi's High School Uniform Saturday: Prisoner Usagi Sunday: Usagi's Junior High School Uniform
Friday: Nico Robin from One Piece Saturday: Princess Aurora from Sleeping Beauty Sunday: Chii from Chobits
Plus: A-Kon, Anime EXPO, Sailor Moon Con, AnimeFEST, & ANT