I did some calculations regarding that here. While not exactly the same situation, it could help you decide if it's worth it. After that I compared Bravura using Upheaval with Ukon using Ukko's Fury to activate aftermath and Upheaval in between, and they didn't difer by much. There's a lot of assumptions to be made there, though, but I think that in the end, the difference won't be much in either case.
XI Wiki


