pkgsrc quarterly vs. current?

["Thomas Mueller" <mueller6724%bellsouth.net@localhost>]

What is the reason for both pkgsrc current and quarterly?  Is there a big 
difference in the stability of the pkgsrc structure itself?  I think it would 
be about the same.

I am strongly inclined to go with the current version because I don't see any 
advantage in waiting three months after release of a software application, such 
as Abiword, gnumeric or Seamonkey just because it was released just after the 
quarterly pkgsrc.

FreeBSD ports collection has no separate current and quarterly versions.  Do 
any other source-based package managers have distinct current and quarterly 
versions?
 
Tom