Standard vs thorough scan

Which one do yo prefer? What are the differences beetwen standard and thorough scan?
Is thorough a lot better than standard? I just can´t wait 3 hours to complete scan, so I usually scan in standard mode and after some time with ESET online scanner.

Im thinking about buying kaspersky, but if standard scan is enaugh…

What do you think ;D

I have only ever done a through scan with archives once shortly after installation just to ensure a clean start state, but with XP for example avast will do a boot-time scan after installation if you select it, this I believe will be quicker and reasonably effective. Like everything in life things are a compromise.

Archive (zip, etc.) files are by their nature are inert, you need to extract the files and then you have to run them to be a threat. Long before that happens avast’s Standard Shield should have scanned them and before an executable is run that is scanned. Thorough is also by its design very thorough and perhaps a little overkill for routine use, were a Standard scan without archives should be adequate.

Well, on buying NOD32 or Kaspersky and testing avast Home (free) is just very different things.
About scanning sensitivity, if you scan your downloaded files, running just the standard deepness will be enough. If you download that many files and don’t test them just after downloading, it will be safer the thorough scanning.