What if sidious had gone to mustafar instead of vader
If Sidious had gone to Mustafar instead of Vader, the outcome of the battle against the Separatists might have been different. Sidious was an incredibly powerful Sith Lord and skilled in the dark side of the Force. He likely would have been able to defeat the Separatist leaders with ease, possibly without anyone else needing to die.
However, if Sidious had gone to Mustafar, he would not have had Vader to turn to the dark side. Vader's fall to the dark side was a crucial part of Sidious' plan to gain control of the galaxy. Without Vader, Sidious might have had a harder time consolidating power and might have faced more opposition from the Jedi Order.
In the long run, it is possible that Sidious could have still achieved his ultimate goal of galactic domination, but it would have played out differently without Vader's presence at Mustafar.