So I had put a 6 month bookmark on this to circle back to see how it played out…
Current dominant variants:
BQ.1/BQ.1.1 - descendent of BA.5
XBB.1.5 - descendent of BA.2
So, closer to BA.4/5 than BA.1. I don’t know that I’ve seen any head-to-head data on the BA.1 bivalent vs the BA.4/5 bivalent though. I believe they’ve both been used in some places (UK and Canada, I think?) so might be floating around eventually if it’s not already.
Unfortunately, the massive amount of new cases is promoting evolution of any variant that can evade the vaccines and/or previous infections. Infinite dice rolls to find weaknesses.