MSI
pros,
Has display outputs on the rear panel to use the onboard GFX.
Has Lucid Virtu and Quicksync.
Gen3 PCI-E switches so both the PCI-E slots are Gen3 when a ivybridge CPU is fitted and next gen GFX card.
2 more SATAIII ports
UD5
Pros,
Three Firewire connectors.
Extra USB3 internal header.
Far more CPU VRM phases to overclock better (20 vs 8)
Two different boards, one has features the other is built to oc better/higher
There are other differences but it starts to get a bit picky