I tried to insert some links for you to use... but they are not working correctly.
Do a web search for "fedora 9 vs opensuse 11" or "fedora 9 vs ubuntu 8.04".
Comparing Fedora9 to Ubuntu 8.04 or OpenSuse 11 is probably one of the easiest ways to see what is different, or better about each one given that they are all current release distributions.