Again, R4 and M3 is not a slot-2 device. It only plays DS games. If you're looking for slot-2 device, you can google to find reviews. I have not reviewed any slot-2 devices yet.
If you want to get a slot-1 devices that plays DS games, R4 and M3 Simply are both the same. They are manufactured by the same company. R4 gets their updates first and M3 gets it a couple days later.
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