Fedora often throughout releases includes new software and features a generation before other mainstream distros. Most notable being Fedora 15 featuring GNOME 3 which can only be described as outstanding and a drastic improvement on the Ubuntu Unity Desktop
http://distrowatch.com/table.php?distribution=fedora
However stability is more important than features which in general is the reason I prefer to run Fedora from LiveCD.
Ubuntu is now losing ground to other distros. such as Fedora and Linux Mint (Ubuntu based)
It is worth mentioning that the Linux Mint team have tamed Pure Debian to the extent that is almost as easy to install and use as its Standard Ubuntu based Edition. It would seem Linux Mint Debian Edition (LMDE) is the way forward for the distro. but its not quite there yet. The current RC of the latest ISO respin is now available to download and as with Fedora can be run from the LiveDVD
http://scottlinux.com/2011/05/21/linux-mint-debian-edition-lmde-review/
http://www.linuxmint.com/edition.php?id=88
Other lesser known distros. are showing good too such as Pardus Linux
http://distrowatch.com/table.php?distribution=pardus
I thoroughly recommend Linux Mint 11. Its easy to install and easy to use plus it comes with much of the software you are likely to need preinstalled.
Linux Mint 11 Download
http://www.linuxmint.com/edition.php?id=81
Linux Mint Installation Guide
http://www.linuxbsdos.com/2009/12/03/linux-mint-8-installation-guide/
Linux Mint 11 Release Notes/User Guide
http://linuxmint.com/rel_katya.php
You download the ISO. image of Linux Mint 11 then you need to create a Bootable LiveDVD for installation
https://help.ubuntu.com/community/BurningIsoHowto
Linux Mint 11 can also be run straight from the LiveDVD from Boot without touching your Hard Drive
LUg.