Phone Rebel cases have a horrible reputation. The Phobe Rebel subreddit is full of instances of cases breaking from very little use. I would avoid at all costs.
Mous and Gripmunk are better made but not thin. Between the two I’d get the Mous, I didn’t like that there was a seam that went right around the circumference of the Gripmunk, it dug into my fingers where I held the case.
The Sheath, Pitaka, and Benks cases should all be very good. Comparing to the Armor Pro cases specifically I’d probably just go for the Caudabe, it’s less expensive and should be at least as thin. Unless you love the look and feel of aramid fiber, then I’d do the Benks over the Pitaka because again, it’s less expensive.