Which version to play?
1.0 or Episode 1 - Part 1?
What's the difference between the two?
Go with ProGamer Johnny advice.
v1.0 has a lot of content, is pretty good/interesting, depending on your preferences, and some choices. It is "done/finished", has 3 to 4 endings, well, it's really 1 ending, with 3 to 4 variations...lol One variation is sort of, consoling, but not completely satisfying given what transpired...lol
Episode 1 - Part 1, it might be considered a "re-work" of the original, and to a degree that's true, but this E1p1 version is very different in many ways. Right now, I do have a worry it could go "off the rails" like the 1st one, if this project gets rushed, abandoned, or anything like that.
My personal opinion, between the two, I prefer E1p1, so far. V 1.0 wasn't horrible, but after a certain point, it was a bit messy, and took a very hard left turn at Albuquerque...lol It felt like the dev rushed to get an "ending" with some sort of "options" just to have a "completed" rather than "abandoned" project. Again though, it's worth a "play" if NTR is definitely your "thing".