comparing low limit games on different sites

[Pog0]

So I've been reading the "reviews" of sites on BW and they do a comparative rating of the softness of games.

The 1/2 and 2/4 games on the party network are rated A- (good)
The 1/2 and 2/4 games on the poker network are rated C and C+ (very bad comparatively).

I know that the poker network isn't very popular, but does anyone have any supporting evidence that shows that it is infact easier to win on party than it is on the poker network (Pokerroom, hollywood, etc)?