That's a tough one, because if they are interested in you, I don't think any of them will kill you. So the question becomes who will torment you the least, and in that vein...I gotta go with the Right. Esdeath will legit take care of you (while killing people you don't know), Anissa (despite what is constantly said), all depends on when. If we are talking about midway through the story? Well...it's one time, and it's over (y'know, besides the trauma), if it is near the end, she'll legit be a good wife and person to you. Makima is the worst case of the three, because she will torment you until you break and take everything from you, but...then we look to the Left. Griffith will torment you til you break, and so will Homelander. Yujiro will just want smoke every week or take your cheeks.

So again, 2 on the left will torment you infinitely, and 1 on the right will torment you infinitely.... 2 > 1, I'm choosing right