If you mean the most powerful faction in the sense that "if you had a million dollars riding on the line for you to win the game" who would I choose? Thats a very easy answer, England. I don't believe they have the BEST unit roster, but it is certianly very good. I believe they have without a doubt the best and most secure starting spot. And no, they are not my favorite faction at all, so I'm not biased in this.