Just out of curiosity, how would you compare the Ubuntu LTS releases against each non-LTS releases with regards to stability?
I use Fedora in computer labs and on my personal desktops and I rarely run into problems... although a lot would depend on how many packages one has installed and commonly use... and the hardware you are running it on. I use fairly common, business class Dell desktops and laptops and almost never have hardware issues... so your mileage may vary. I've seen hardware that hates one distro and loves another and vice versa. Fedora generally just works for me.
From what I've read, Ubuntu provides about 12-16% of their own packages that are not vetted in Debian's repos.
I don't think this is worth arguing over but I think your comparison of the stability of Ubuntu vs Fedora was overstated... at least it was from my perspective. Obviously not from yours though, eh?