M3 is by far the superior flashcart. Just look around in this section and you'll find two things: people talking about how great the M3 is and people talking about how much the MMP sucks. You can get the MMP to do the same things as an M3 to a certain extent, but it requires a firmware change and other stuff. There really isn't any reason to buy any sort of MMP. Stick with an M3, G6, or Supercard.
I think saying that an M3 makes your DS exactly like a computer is stretching quite a bit. Look at their site, there's a lot of good info on it.
M3 site: http://www.m3adapter.com/
G6 site: http://www.g6flash.com/
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