I would vote neither! I think avatars are just fine the way they are.I wonder... if it came to a choice, would people rather have larger non-animated avatars or smaller animated ones?
One of the nice things about CFC is that avatar size is in kept at a reasonable level. The main purpose of avatars is to help identify the poster, which they currently do just fine.
While making them bigger would give people more room to express their creativity, chances are that the people who can't find anything suitable for 70x70 would still produce eyesores if the limits were increased. They'd just be harder to overlook.
As for animated avatars:
Spoiler :![]()
(credit to zwelgje)