Anti virus stuffs!

So I just got my new computer and it comes with the anti virus "trend micro titanium internet security", is this decent to stay with or should I just switch it for AVG or something else?

I'm using Microsoft Security Essentials and is the one I recommend to most people, is not intrusive as many antivirus and is really light performance wise, not sure about how good is the virus detection but should be good since is always mentioned as one of the best antivirus.

Seems many people on southperry use it, guess I will as well =O. Thanks!