I have already noted a few technical differences between Fedora and Ubuntu which I am going to comment.
Fedora does not automatically remove /tmp contents on reboot, I prefer Ubuntu's behavior, applications do not rely on tmp contents across reboots and regular users should not be working on /tmp. If there is no other automated cleanup mechanism -did not check yet-, on the long run the user will get a full root file system.
Repository information cache
I don’t have a YUM technical background, so please excuse me if I will write something terribly wrong here.
From an user perspective I have noted that yum does not have an explicit cache mechanism, you don’t need to explicitly update the cache. The good side it automatically gets the required information when a new repository is added and frees the user from a repetitive action. The bad side is that it may introduce some network/time overhead during package management opertions.
Software update policy
I did not read Fedora’s update policy yet but I have noted that they provide regular release upgrades for some software, piding was updated to 2.7.10 from the regular updates repository.