Warning! This article contains spoilers for Star Wars: Darth Vader #42 While it may seem impossible to consider that someone even worse than Emperor Palpatine could have ruled the galaxy in his stead, the latest addition to Star Wars lore confirms that Darth Vader himself would have been a far more terrifying option as Emperor. The reason this is the case is that Darth Vader is currently conducting some pretty grisly Sith science experiments on living organisms, which is just a peek into how Vader would likely handle maintaining control over an entire galaxy.

https://screenrant.com/darth-vader-sith-science-more-terrifying-emperor-palpatine/