Firstly.....Gogeta is a far lesser fusion compared to Vegito and Oh, you're wondering why I'm stating this? Haha, very simple known reason that any actual Dragon Ball fan should know already......Vegito is a fusion which combined both beings as 100% with Gogeta being a fusion which combines both beings as 50/50% power So in retrospect, Gogeta being a fusion and beating Broly is outta the question because Vegito is vastly superior and more powerful than Gogeta is. I know the Gogeta fanboys are gonna mention "Fusion Reborn" and GT about how Vegito never showed up again which is a dumb argument by infinity.....
1. Gogeta used a spirit bomb type technique to beat Janemba who was literally made of Evil!
2. GT had Super Saiyan 4 (SSJ4) Gogeta who beat newer opponents and Vegito was never shown due to the fear of them never defusing again.
So before you try to say "Toei had said Gogeta is the strongest character." Card.....he isn't....Vegito? Broly? Beerus? These characters are above even SSJ1 Gogeta without them getting actually serious! I highly doubt Gogeta is gonna make a dent to the new Broly but I won't completely ignore it we will wait and see.