Right, thanks for pointing that out. I was actually coming at it from a different angle - Atlassian's support, and the ecosystem (at least in the valley) around confluence, make it (in my opinion, I'm sure others might differ) a better fit for companies that are willing to pay money than a tool like TWiki.

It's not as big a difference today, though, then it was 6 years ago. But, the thing is, Atlassian almost gives away their software (compared to what other companies charge) - so, to some degree, it's almost like comparing two free software packages with each other.

Confluence's real competition is actually sharepoint, more than it is TWiki.