What happens if you give Miller Rucker's evidence?
Well I haven't been able to verify it yet since I crash when I use the train and so can't finish the game until they update it but from what I've read If you give it to miller he gives it to the big bad for no outcome, if you give it to vega you get access-codes from janus to a room you might need to access in the final mission depending on what route you want to take (there are two and you can do both if you hurry). If you keep it then don't give it to vega it will do nothing.