Get the MB Pro, it's a beautiful and very powerful laptop perfect for your needs (SC2 will run smoothly and nicely). You can alway install Windows via Boot Camp should you need it for any WIndows-only software although OS X has plenty of amazing software for you to discover.
And if it helps, I had been using Windows PCs my entire life and it took me about a week or so to feel ever more comfortable using OS X when I made the jump.
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