Most likely 1.2, it's an older model, doesn't matter anyway, still enough for 1080p 60Hz.
I don't see a reason not to go for the 75Hz model since a 1050ti is plenty to run games like CS:GO and League at 75 FPS easily, but sure, whatever suits you.
dont really care for 75hz since i have a 1050ti, so im going to keep the one i ordered
but how can i know if it has hdmi 2.0 or 1.4 ? on the site in the specs it says just hdmi
Most likely 1.2, it's an older model, doesn't matter anyway, still enough for 1080p 60Hz.
I don't see a reason not to go for the 75Hz model since a 1050ti is plenty to run games like CS:GO and League at 75 FPS easily, but sure, whatever suits you.