I haven't played in a few updates, but as far as I remember from that point, there was no "better choice", it was just a matter of which of the mafia-exclusive girls you were interested in having scenes with. I think the story is overall the same, aside from the direct mafia-related story stuff, and even then it was largely similar at the time.
Things could have changed since then, though, honestly. All I know is that the way it laid things out was that certain girls might be exclusive (or become locked out) by choosing certain mafias, and it was generally made fairly obvious who those girls would be (i.e. the ones you interacted with in each of the mafia "introduction" quest lines, and a couple others that they telegraphed within said quest lines).
That said, I do think any game that has this much content/takes this long to go through things and has path-exclusive choices like that, which lock you out of seeing content with one (or more) girls by choosing to see content with another, and not having an option to see content with all of them, is always disappointing. Because nobody is going to waste the time to keep up three separate saves to play through all three mafia's content.
