If you bought one of these now, you would be wasting your money, since you could buy the same thing less, without the mediocre DSi elements. You even get a GBA slot to go with it!
Well, it all depends on your preference, but I'll stand by my notion that the phat is best XD
Better stereo/surround speaker system, larger screens, default dimmer backlight so it is not so blinding, better battery life because so, stronger, more-durable, tougher button life so they aren't so worn out after a short period of time, the list goes on. Oh and if you're comparing this to a DSi, then I'll add in the list of "you get a GBA slot".
Lol that's going to be farther in the future. But seriously though, you're considering buying an XL when you have a DS Phat already?
-- Lesser quality of sound
-- Brighter light (bad)
-- Camera (waste of money. Use a separate camera which has much better quality)
-- Music (use an ipod or mp3, which also has better quality)
-- Same size screen
-- Lesser button life
I'm telling ya dude, like my last post, you're seriously not going to miss anything. I would wait until the 3DS when you actually have something new to look forward to.