Before Quinn, I would have said Zander. After Quinn, I realize as much as I love Zander and how he is still very much my heart dog, living with Zander is a certain, personal, sort of hell. But, the other side of that is how much I have learned with Zander. I would choose him because as miserable as he can make me, I love him dearly and we have learned so much together. I could only imagine how much more we could learn to live and cope with each other if we had forever to do so.
Quinn, on the other hand, I could not cope in many ways without her. She is an extension of me that makes me better at most things. I would choose Quinn because she is a valuable tool in my life, much in the same way Lexapro is. Eternal life with her would be easy, comfortable and painless.
So, basically, I am eternally indecisive and my entire time would be taken up trying to choose.