Buy PSP or Nintendo DSi XL?

[Architect]

I have done some research and I found out that :
1- PSP :::: Better graphics - Better games - Better design - Multimedia .
2- DSi ::::: More Games - Better controls - Better RPG games - More durability .

I am into Better controls and better RPG games in the DS but I am a suck up for Better Graphics and Better Games in PSP .

I am buying one of them in the next 24 hours , which do you think is suitable for me ?