Definitely alone..
I don't hate loosely, so if that person falls in my hate list.. it wud be for a good reason.
Although having them there might motive me to built a Macgyver style solo boat off the island.
Do I hate them for causing bodily harm to a love one? Yes then I’d prefer alone. Why have a murder on top of being stranded. Otherwise life is too short to hate anyone. An I’m sorry with a hug and *POW, BLAM* - I have a friend again.