GBA, PSP and 3DS, Which was better?

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GBA would have blown passed 100 million if it hadn't been cut short, it only really got 3 years as Nintendo's flagship handheld and sold like hotcakes during that time.
3DS and PSP took far longer to reach similar totals, with some significant bumps along the way like 3DS needing an emergency price cut and PSP being overrun by piracy.