system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] How would things have changed if Ahsoka never left the Order and was present in Coruscant during the events of Episode 3?
gpt
Had she been on Coruscant and still with the Order, she would have been the best chance for Anakin to come to his senses. But as Anakin proved on Mortis when he believes in something he will turn on his friends. It is quite possible that Ahsoka would either die at the temple or join her master.

Both of those outcomes directly affect the Rebellion as Ahsoka was an integral part of it's growth and directly assisted Hera Syndulla and the Jedi Kanan Jarrus AKA Caleb Dume and his padawan Ezra Bridger. Without her guidance and assistance on Malachor, it is likely that Kanan would have died and his padawan Ezra would have become a disciple of Maul. Tho they may have both perished when Vader arrived. 

Had she joined the Empire, she would've become a powerful Inquisitor and while not being the first Grand Inquisitor, she likely would have replaced him when he died, possibly at the hands of Kanan or something else, possibly Ahsoka herself.