Well, the big difference between the two is that the MSI doesnt support Crossfire/SLI and has two less SATAIII ports. I imagine it also has less of other small features like USB, fan headers and other small things.
Why are you deciding between these boards? On Newegg they are $100 apart, aiming at completely different markets. Get something like an AsRock Z77 Extreme4, its procides near all the features of the Sabertooth for a much lower cost.