Which mirrorless camera brand is better?

I'm finally getting a new camera! My stepmom is so awesome, she supports my love for photography and she offered to buy me a new camera. I'm extremely thankful my dad met her. I now believe that Peru ladies are some of the most family-oriented women since my stepmom and her family are treating me as if I'm really blood-related to them. So now I'm confused which brand to go for. I'm thinking of Sony, Canon, and Fujifilm. Among these three, which is the best brand? What are the general pros and cons for each brand?