I enjoy Guardians of the Galaxy more largely because, overall, I feel like more happens from month to month. In Avengers, I feel like it's all building to some grand conclusion, with snippets of it being included here and there, but ultimately feel like it's taking too long to get to where it needs to go. The use of evil Avengers and the current time jumps all feel a bit like treading water to me. Whereas in Guardians, even though I don't really agree with a few of the character makeovers, it remains fun and entertaining, with quips and jokes and action.