Actually, I meant 'non-commmercial' to be descriptive of the fact that Debian
is not a company while Redhat
are both companies and the distributions part of a commercial enterprise.
While the others are open-source and can be obtained at no cost (or little cost if you consider the media and bandwidth to obtain them), they are commercial entities driven by commercial needs such as market share and I believe this affects their offerings.
Debian has no profit motive and no shareholders to answer to and this shows in that often their distro doesn't include the latest whiz-bang feature, but IMHO the stable distro is just that....rock solid.