I know this is a big question....however all the answers I can find are fairly old, since with firmware updates and new flashcarts come new features. So the R4 seems pretty cool, it is considered popular, cheap, and plays most of the games. One thing I keep seeing is that because it is cheap, it's the best flashcart. I don't want to get a slightly inferior card just to save $10. But between the M3 Simply and the R4, it would be pointless not to go with R4 since (as I understand) they are completely identical. Even though I doubt I will need GBA I learned that Slot 1 cards can't play GBA and Slot 2 can play GBA & NDS...so what's the reason not to get slot 2? Basically... What's the best card(s) with the most features- Download Play and w/e? With price not being a factor to rate cards (though there is a limit....wouldn't want to spend $3000 on something I can get for $30 just because the interface is cool-looking) Sorry...I know there are a lot of topics on this, but many are old or directed very specifically between 2 cards.