Interesting numbers, because the free version of a-squared "only" has 1.429.277 signatures, so it may signify that the paid version detects quite more malware (or it's full of bogus sigs). The only way to know if one is really better than the other is to throw complex tests at them, to see how they perform detecting malware, and even in that case, there would be other factors at play that could yield different results on different computers. Going to a spyware infected site would not show much, and you may end with a infested computer as well, there's no watertight protection, unfortunately (unless you're using a Linux distro from a Live CD).
