Do you mean "Adware", or do you mean "Ad-Aware"? I suppose Ad-Aware, because it would make more sense. Two spyware / trojan / dialer killers compared with each other.
I prefer Spybot. Freeware, multilingual (even "exotic" languages are supported!), rich in features, even comes with a nice HOSTS file that blocks a lot of shit - perfect!
ACDSee or ThumbsPlus?