Wind Waker no question. It was the first time we saw toon Link and a lot of us went through the journey of hating him to loving him. Wind Waker was a fabulous game too and wouldn't have worked with any other kind of Link, Nintendo really knew what they were doing, whereas I feel as if PH, ST, MC FS and FSA could have been any other Link and it wouldn't have made much of a difference, really, in my eyes, Wind Waker is the only toon Link we've ever needed. No other toon Link has utilised the style as well as WW Link did, for example his eyes moving when you play the wind waker and other nice touches like that.