I only use Lavasoft Ad-Aware. Is there any reason why Spybot might be better?

Besides using Opera spyware never gets in --at least according to Ad-Aware. My new computer has been installed for months and all my Ad-Aware scans have yielded negative results. I'm pretty sure it would be otherwise with MS IExplorer.

Spybot's virus/spyware tables are updated more often and they also just work faster.

I think Ad-Aware will do it alone but Spybot S&D also is a handy program. Even there is a low chance it might find something that Ad-Aware can't find. I was used to scanning my PC with both of them but SpyBot doesn't seem to find anything different than Ad-Aware. I don't bother using it anymore but I can't argue that it is good. It's a matter of choice.