My reason is whenever Gogeta fuses they start with only 30 mins but its different for Vegito because since Vegito has a full hour to fight it makes it easier and imagine this if your fighting and your fused and you time runs out and only that's the time you think about Potara so then you grab the earrings and fuse then you would have more time to fight plus even though in Super Dragon Ball Heroes Gogeta had this new Super Saiyan Blue form
(that i call Super Saiyan Striker Blue)
Its nothing compared to Vegtio Plus one thing you need to notice is The Final Kamehameha is stronger than the Galick Kamehameha becasue Vegeta finds a new beam called Final Flash so in the end Vegtio is the winner. this is kinda unrelated to the question but if both Gogeta and Vegito lost they would need to fuse and become the strongest and ultimate warrior Gogito