I just use the freebies so cost isn't an issue. Personally I like Superantispyware.
Since I have never had a malware problem its differcult for me to say if this program is better than anything else. It certainly seems to work as I have never been bothered. Seems stable enough, lets put it this way its never crashed or caused any sort of lock up or indeed any problems at all. It just removes the malware/spyware.