I would imagine most of the people on here would lean towards the M3, as I would, but the Supercard isn't really much worse. Game compatibility will vary a very small amount and the M3 is a little higher quality IMO in regards to overall construction (the interface is also skinnable, useless but cool). But you're going to pay for that extra quality. If money really is the issue than just go with the Supercard, it should do whatever you need it to.
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