After some long thought about it, I'll just say this: The graphics on the PSP are the best, the games on the DSLite(so far) are the most fun, and the Micro is the best as far as the vintage factor, and the thing is freakin small. The PSP's loading times can be pretty bad, but I've noticed the newest software updates must have taken care of some of those loading times because this one isn't nearly as bad as the PSP I had last year.
Size and weight wise the GBMicro owns both of them, but the DSLite comes in second. While it is smaller in square inches than the PSP, it is SUBSTANTIALLY lighter, and is designed much better, ergonomically. Also, if you want to carry around a bunch of games with you, the DSLite owns all. The game carts are about the same size as a SD memory card.
All in all, I would say if you're a serious gamer, the PSP is for you...if you want a fun system thats fast and can fit in a cargo short pocket, then go DSLite, and if you want something that you'll confuse with your cell phone, go GBMicro. Here are some pictures:
p.s. Another cool thing to check out is the limited edition region free Ceramic White PSP. You can find them on ebay. They look freakin' sweet.
