Riften - Jarl Laila Law-Giver gets replaced by Maven Black Briar. And if the Imperials win the Battle of Whiterun, Heimskr gets imprisoned, even though we all hate Heimskr. I guess the big losers if Vignor Gray-mane gets to be Jarl would be the leader of Whiterun city guard and the Battle-born's.
TO me this is rather neutral, they both seem like ok people in the game, not inherently evil, and may even look out for what's good for Whiterun. Whiterun Hold - Balgruuf gets replaced by Vignor Gray-mane. Who does the Jarl of the hold get replaced by when the Stormclocaks vs Imperials win? This is a different idea on how to choose Imperials vs Stormcloaks that no one has mentioned in any video.