Your question pre-supposes that the GP evaluated Debian and decided against it. While this may be true, he/she never said that.
In my case tho, I found Debian to be moving at a glacial pace. Fedora OTOH is always fresh and current. There's nothing wrong with Debian, and sure some people don't mind running Sid. Fedora is my favorite flavor of ice cream tho.
Parent omitted reference to Debian, while bemoaning Ubuntu quality degradation - I would expect most people disappointed with Debian derivatives, but familiar with the tooling, would consider moving further upstream rather than outright abandonment.
