My test of Adaware,Spybot,Spysweeper,Spyware Doctor and PestPatrol rate Spysweeper best because of the fact it finds spyware and informs you of changes to your internet setting with Spybot as worst because it never finds anything even though others do. Your worst and best would be apprectated.
Just get MS Antispy and be done with it. there is absolutely no point in trying to 'compare' programmes as a lot depends on the intervention of the end user. I use AVG and MS Antispy with a bit of common sense and get no problems whatsoever, bearing in mind that I try to open any attachments that I get sent.