Which is a better antivirus, Avast! or Microsoft Security Essentials?

I understand that a lot of people are going to say that it boils down to preference, but I'm really curious to know what people think regarding Avast! vs Microsoft Security Essentials. I used Avast! for years, before switching to MSE, and I've recently heard that Avast! got a big upgrade. So my question... show more I understand that a lot of people are going to say that it boils down to preference, but I'm really curious to know what people think regarding Avast! vs Microsoft Security Essentials. I used Avast! for years, before switching to MSE, and I've recently heard that Avast! got a big upgrade. So my question is this... is MSE worth it? or should I go back to Avast!?
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