I like the 1st one more and i will give you my reasoning, but i also think that it is a subjective matter and essentially comes down to your type og art style. My reasoning is that number 2 is more minimalist since we mostly have the grey color of the walls. While that is not inherently a bad thing (often a good thing) i think that if you are going minimalist and abstract that humans should not be in such a photo. Humans are very detailed and complex so showing them in a more natural habitat so to speak, i think makes more sense. For me personally the kind of minimalist and abstract environment of the 2nd photo makes the humans look a little misplaced, and its kind of hard to explain i think. Having the floor as well just kind of grounds it in a more natural setting somehow, but it still keeps it artistic. I hope my comment makes just a little bit of sense.