I don't mean to add more oil into an already busy flame fest. It's just that I am surprised nobody seems to share my experience.
I have tried Fedora because I actually liked systemd's design principles. However, I was never able to make fedora boot as fast as my Ubuntu systems. I admit that I haven't tried digging very much deeper than disabling a couple of targets that I don't need on my system. But, on the other hand, no such tweaking was necessary with Ubuntu.
If my experience was representative at all, preserving faster startup times seems to be enough reason to hold on to upstart.
There is a lot of heated debate in this thread about backwards compatibility, UNIX philosophy, hackability and whatnot. But at least on my setup booting Ubunutu (12.04) is about 20s faster than booting Fedora (16). For me that is reason enough to prefer Ubuntu.
How do upstart and systemd compare performace-wise in your setups?