I would definately go for Asus A8N SLI Deluxe any given day.
MSI isnt bad but they just cant match Asus when it comes to performance,stability,overclockability,robustness.......
Call me an Asus fanboy,but yeah,i am proud to be one.I have used many Asus boards,none have given me any major problems.
Another thing- Asus's board layout is immaculate if you observe carefully.