Its a case of each to his own, and people will normally recommend what the are comfortable with, and are, for some reason, protective of the programs they use and are normally loathed to see that something could be better.
I have test mosted, if not all, AV programs, and there is only one program I would ever put on any system.
I wont say what it is, because TBH, I could'nt careless if you or anyone used it, it makes no difference to me in the slightest, and if you, or anyone else, is happy to use AVG/norton whatever, then fairplay.
Dan,