if we talk about games then....its up to personal tastes
now, if we are talking about the best HH design, for me GBA Micro represents all that a portable should be. Small, slick with a excellent screen, simple amd functional a game console truly made to game on the Go...
PSP? A disc based multimedia system? LOL no thanks
3DS? Have you seen the size of that XL thingy? NO thanks
GBA SP is also great, but Micro wins by a body thanks to its small size and much better screen.
GBA micro FTW!