Hey, there, Bi. Since I don't know the science behind how Myostat does what it does, you'd best not take my advice. (grin)
If you'd like the best of both worlds, though (hypertrophy and strength), take a look at some of Chad Waterbury's work. I'm doing ABBH and have seen some pretty amazing strength increases as well as hypertrophy.
My understanding re Myostat is that it's more of a long-term commitment, compared to Mag-10 which makes its effects known more quickly. I would imagine that along with your workout and supplementation some HIIT cardio would be complementary on two different levels: Increasing the capillary network will make for more efficient delivery of nutrients to the muscles worked out, as well as more efficient removal of waste. Two, HIIT, if I remember correctly from something I read in one of Fred Hatfield's books increases the number of (muscle)cellular mitochondria.
Good luck to you!!!