The raw fire power is in Faze's favor in my opinion as Twist, ropz and rain are better than hobbit, axile and interz. The Ruski IGL is slightly better than karigan (I repeat, my personal opinion, no need for Faze fans to get offended) but that should not balance that fire power difference.
So Faze should be favorite.
I am curios if dust will be chosen. It would be fun to watch these teams clash on that classic map.