I think air charge cancels are going to be mostly annoying to use. But, I think air charge cancel > throw when you meet in the air will be fun.
As far as frame advantage, there are going to be all these weird heights with regards to charge canceling. You need to charge cancel at a height where you have enough time to get out an attack. There are heights where if you try to JC your attack won't come out. if you JB, your attack will come out but your frame advantage and combo potential will be gone by the time you land. (There's virtually no possibility to combo off JB after a charge cancel even at ultra-deep height).
Then the fact that lots of times when you hit with a JC, you already have an airtight block string, or if not airtight, very plus even after you land.