Same log files – you’d think they’d come up with something like similar results – not a chance!
For instance, look at the number of Visits for the month of July (the most recent month for which we have all the data). According to Webalizer this site had 135,352 visits in July whereas Awstats only has 30,035! Look at the number of pages served in July. Webalizer has this site serving 333,461 whereas Awstats has it only serving 178,395.
How can such enormous differences be accounted for? Which one do I believe? I honestly have no idea!
By the way, the peak in May/June has to do with the Web 2.0 controversy!