The Debussy by far. It's much more complicated than the Yiruma piece:
1) even though it's short, it has definite movements, whereas the Yiruma basically has the same scales and arpeggios repeated several times
2) it varies in pace and volume
3) there is much less repetition of mood.
To be fair, you did choose my favourite Romantic pianist to play the Debussy though...
EDIT: From Titanic's post, it's obvious that I misread the OP. I thought you were asking us to express a preference between the two pieces on offer. I'll have a think...