I have a 5x, and just go caseless. It's a shockingly strong phone.
My baby likes to chew on it, and she has some sharp little teeth. No scratches yet.
If you aren't prone to dropping your phone all the time, consider it. :)
(If you don't like the concept, that's okay--I used a case on my phones for the vast majority of the last.. 15 years or so, so I get it.)