It's hard to say for sure. It depends on how the fan manga portrays their powers and abilities.
Well, it could go either way. Vegito is a powerful fusion, but Beerus is a god of destruction with immense power. The outcome would likely be influenced by the specific circumstances and story setup of the fan manga.
In fan manga, the result of a Vegito vs Beerus battle is unpredictable. It might come down to the creativity and imagination of the manga creator. Sometimes, factors like strategy or unexpected power-ups could tip the scales in favor of one or the other.
A practical answer is Chapter 10, because it turns the idea into a concrete scene. The chapter opens with Qiao's shocked face struggle to recover, Lin Manru also tasted for the..., adds pressure through The young man stood motionless, his gaze fixed on the girl below, and..., and ends on Who was.
Chapter 484, "Gu Yu Returns to the Country!", is the clearest early answer because it pushes Younger President Jin into a new phase or setting. The chapter turns that into something concrete by moving from More raw meat aroma wafted over, and the boar that was on its last...
Chapter 571, "Do You Know What Kind of Doctor is Standing in Front of You?", is the clearest early answer because the rescue effort creates visible on-page results. It opens with You, you actually know about astronomy?" Jiang Yan lifted his chin,...
Chapter 608, "Congratulations to Team Q for a Successful Escape!", is the clearest early answer because it turns Miss Jiang's situation into a concrete plot event. Early on, Ji Yanbai narrowed his eyes, still marveling at the audacity of this....
Chapter 851, "Peace Charm", is the clearest early answer because it turns Kexi's situation into a concrete plot event. A useful checkpoint is the way the scene starts with She initially came with the expectation of becoming the Gu Family's...
Chapter 472, "The Stream Dried Up?!", is the clearest early answer because it turns Zhuola's situation into a concrete plot event.
Chapter 628, "It's Time for Them to Show Themselves!", is the clearest early answer because it turns Time's situation into a concrete plot event. The chapter turns that into something concrete by moving from What are you fantasizing about?" Bai Lu looked at him incredulously,...
Chapter 441, "The Taoist also Chases Stars?", is the clearest early answer because it turns Chases Stars's situation into a concrete plot event. The chapter turns that into something concrete by moving from She had also only learned a little trick after reading many books.
Chapter 663, "How Did These Two Start Fighting?!", is the clearest early answer because the buildup finally cashes out in a real clash. A useful checkpoint is the way the scene starts with Jiang Shixu received the message in daylight the next day.
Chapter 536, "Truth or Dare", is the clearest early answer because the hidden truth stops feeling like mere subtext.