Nintendo DS (Lite) versus Sony PSP

OK all you gamers out there.  I am thinking of getting a toy for Christmas, for me that is, I already have stuff for the kiddies 🙂  I am thinking of getting some kind of hand held video game system, and I have it pretty much narrowed down to two options.  These options are the Nintendo DS (Lite) or the Sony PSP, are there any more nowadays?  Having said that, I guess the real question is what are your experiences with these two units, which one do you prefer?  I have read a lot about them, and it kind of seems like it’s a toss up, mostly decided by personal preference and gaming style/tastes.  I wanted to get your opinions though, so jump in the forums and share your thoughts, ideas and experiences with these cool toys.  Maybe you know of something other than one of these two that is better, I dunno.  Tell me what is on your mind, and what you think!