Bullet was incredibly powerful and it’s safe to say that he was stronger than Luffy at the time of the movie. That said, the gap continued to shrink and shrink until in Wano I would say Luffy is stronger. Bullet would not be able to overpower him anymore unless you think Bullet’s on Kaido’s level and I don’t think so. Luffy just wins in all the relevant stats so this will be a clean outcome. Luffy wins.