Should I use Microsoft Security Essentials or Avast?

I'm a PC Gamer and I LIKE to download a crap load of games once in a while. My ant-virus, Trend Micro, recently expired and I'm in need of a new anti-virus. I know of 2 FREE anti-virueses. Should I go with Microsoft Security Essentials or Avast? Or stick with Trend Micro? BTW my laptop is a Toshiba... show more I'm a PC Gamer and I LIKE to download a crap load of games once in a while. My ant-virus, Trend Micro, recently expired and I'm in need of a new anti-virus. I know of 2 FREE anti-virueses. Should I go with Microsoft Security Essentials or Avast? Or stick with Trend Micro? BTW my laptop is a Toshiba Satelite L505D-GS6000.
Update: INCLUDE A REASON LOL!!!
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