[Raleigh]

As I said, they're only suppositions. However when a guy wrote about Oricon's dubious system he got sued. And people are starting to question even more and more since Oricon seems to be more keen to shut up whoever questions their system rather than explain the process of counting sales. Obviously they cannot overdo it so I imagine they only tweak with small numbers, otherwise it would look too obvious.

I think Oricon is the most recognizable chart because it's been around for long. However yep, it's arguably the most reliable chart around.