Look at the size of Debian. And remember that the package maintainers can only test programs on their computers in their environment. It's inevitable that there will be things that don't work perfectly on your computer in your environment: i.e. bugs.
Slackware, with a much smaller repository, is bound to be much easier to maintain. And if you get something from Slackbuilds or wherever, you're not going to blame Pat if it gives you trouble. As a basic install, Slackware should be better, and when I tested them both it was.