They all have sentimental value to me, so it is hard to pick a favorite. I think I have to choose the GBA SP, it was awesome because of the backlight, portability, and rechargable battery that lasted forever, plus it played all my older games. But I have to mention the original Gameboy because it still has big place in my heart as I still have mine complete in its box and I loved playing Link's Awakening and Pokemon Red on it.