Gogeta Blue is definitely stronger. The reasons being, for one, Goku and Vegeta have gotten significantly stronger throughout the T.O.P, in comparison to the Future Trunks arc. Secondly, irrespective of whether Broly is stronger than Beerus, his power has been compared to a God of destruction.
Unlike most comparisons between Goku's and Vegeta's Fusions, this one has merit to the idea that SSB Gogeta may indeed be more powerful than SS4 Xeno Vegito. Even if the gap in power between SSB and SS4 is minimal, SSB Gogeta would likely still be able to defeat SS4 Xeno Vegito simply by outlasting him.
Gogeta is much more powerful than Vegito, hands down. But, Gogeta in Super Saiyan 1 form (while fighting super janemba) is much stronger than Goku SSJ4.
In Dragon Ball Z: Fusion Reborn, as Veku he is able to survive a fight against Super Janemba for thirty minutes, even outrunning him at some points - though he is unable to deal any damage at all to the demon. Gogeta is formed by Goku and Vegeta because of a desperate need to get rid of the pure evil Super Janemba.
To disprove these power levels even more, is base form gogeta had a power level of 500,000,000 and final form cooler had a power level of 470,000,000 then base gogeta would be weaker than the androids!!
A fusion between two fusion characters would be possible. If Vegito were to fuse with Gotenks using the potara earrings the fusion would be permanent, but the new fusion would have a power decrease once the Gotenks fusion expired.
Dragonball GT's Super Saiyan 4 Gogeta stands no chance against Super Saiyan Blue Gogeta. But Xeno Gogeta, given the incredible power of both Xeno Goku and Xeno Vegeta, would certainly match Super Saiyan Blue Gogeta.
500,000,000Since ssj multiplies a power level by 50, according to v-jump, in his base form, gogeta has a power level of a measly 500,000,000 (which also according to v-jump is just a little bit stronger than cooler in his final form who was defeated by ssj goku).
SSG is more powerful than Potara fusion of super saiyans. This is most likely stronger than SS4 already. Then SSB is up to 50x stronger than SSG.
Gogeta power level(Base): 9 octillion and 25 septillion.
If Whis can't do so much as lay a finger on him, it must mean that the Grand Priest is much, much stronger than him, as speed often correlates to power in Dragon Ball, So even if Gogeta was wanked to infinity and beyond, and we say he was slightly stronger than Whis, he would still pale in comparison to the Grand
Super Saiyan Blue Evolved (超サイヤ人ブルー進化, Sūpā Saiya-jin Burū Shinka), known also as Super Saiyan God Super Saiyan: Evolution (超サイヤ人ゴッド超サイヤ人・進化, Sūpā Saiyajin Goddo Sūpā Saiyajin・Shinka), is an enhanced limit-breaking version of Super Saiyan Blue achieved by Vegeta during the Tournament of Power.
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