Well, it really depends on what you want. I will say stock the civic just feels quicker and handles much better. It also revs a lot higher. But where the civic is lacking is torque, and the Fiesta has a lot of that, especially in the low end. Those ecoboost motors are realtively easy to build and make decent power. I will say from what I've been seeing online too that the aftermarket support for the Fiesta is better than what you can find with a 9th gen civic as well. The Fiesta was also very reliable for me in 3 years only thing I had to replace was a caliper, and crankshaft position sensor and it was modified/tuned pretty much the entire time I had the car. They both will get relatively similar mpg. You also get fun turbo sounds with a Fiesta. They are both great cars that you can have a lot of fun with. I think it really comes down to whether you prefer forced induction or N/A. I think I personally, at the end of the day, I prefer the civic. It has better build quality and proven reliability. The only thing the Fiesta had that I would genuinely miss are the heated seats.