Though they're totally different games. I would just say, SMS, plain and simple. I had so much fun playing SMS, and it a somewhat challenging experience. The level design is also impeccable. SFA is a good game, but sadly, nothing great, or spectacular. The graphics are top notch, and everything seems very refined. But the game itself is not only monotonous, but it just doesn't bring anything new into the gaming world.
SFA would be a great game to show off graphically (though the water in SMS is some of the best in any game).
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