Linux User posted a comparison review between Ubuntu 10.04 and Fedora 13

Spring is a lovely time of year, when the flowers bloom, the birds sing and community Linux projects release the fruit of their winter labours. Specifically, the Fedora and Ubuntu projects come to the end of their six-month cycles in the April/May time frame. This years yield is a bumper crop, with Fedora 13 including a number of interesting technologies and improvements and Ubuntu putting on its finest polish for a Long Term Support (LTS) release

  Ubuntu 10.04 vs Fedora 13