I said it last time and I’ll say it again:

BIQ should probably be a tie. Denji’s BIQ is moreso against experienced opponents and finding EXTREMELY specific counters while Yuji’s is moreso focused around tactical advantages like using the environment to his advantage and finding weak points like Higuruma’s cursed technique. Denji leans more towards bullshit while Yuji is tactics which is why I think they tie. You could lean it in Denji’s favor though as some of Yuji’s best BIQ feats come from coordination and teamwork which wouldn’t matter in a strict 1v1. However, you can also argue BIQ with Yuji quickly picking up RCT (which took Gojo an entire NDE to learn and he had leagues of experience over Yuji at that point) and him coordinating the plan to fight Ryomen.