So to my mind a Mint distro based on Debian Stable is a far easier solution than one based on update packs from Testing.
But does easier mean better?
There are downsides to almost every option you choose, many have already been pointed out in this thread. Debian stable is relatively new at the moment, and probably works with most hardware/software, but in a couple of years time that will no longer be the case and we will have the howls of anguish from Mint Stable users that their distro won't work with their new 8g holographic TV unit. Well no, it won't. And I am sure this is why Clem has tried to 'civilise' Testing with his pack system. Long term though I think it will turn out to be more work than explaining to users of 'Mint Stable' why their new hardware doesn't run and offering them the choice to upgrade to the 'Testing' edition.
So my favoured option would probably be:
Mint Main - based on Ubuntu - because that appears to be what Clem wants.
LMDE - based on Debian Testing - because that is what I want
Mint Stable - based on Debian Stable - because there is a big demand for it.
The various desktop editions can make their own choices as to which one they are based on.
It wouldn't be perfect, nothing is, but in the long run I think it would be understandable for new users and easier to maintain for developers.














