Doggie

Sup everyone, noobvalk here. I've got a question regarding a particular combo: http://www.youtube.com/watch?v=yDDR6DN7OcE#t=00m39s I see lot of Valk players doing this, instead of doing to good old sj.c j.AAA into wolf cannon into falling j.B combo. Is there any particular reason why? The falling j.b variation definitely seems to do more damage. Does it have something to do with wolf meter?