I have the galaxy S series, and have two cousins with the X. They really like the X and think it's a great phone. So do I, but then again I'm bias to anything that has an "X" in the name.
From everything I've seen and heard even though the S and X have similar hardware processing power, the X tends to outlast and out perform the S, even more so know that it has 2.2.
However the S has an absolutely fantastic screen and stands alone in this area.
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