What is the difference between atitc, etc and dxt?

[AC Question]

I bought a game called Horn through Humble Bundle, and there are 3 download options: atitc, etc and dxt. What's the difference and how do I know which one will probably work best with my phone?
I am running a Mediatek MT6592 octa core CPU at 1.7 GHz and a Mali 450 GPU. I have 1 Gb of Ram memory. Thanks in advance.