I have troubles with both the ships... While I'm a huge fan of Nalu, I can't help but like Nali as well. Lucy hasn't known Natsu as long, but Lisanna has, although she was gone for so long. I guess I just have to say that while Nalu is amazing, I won't be upset about some Nali happening either. I think they're both great ships, although I would ship Nalu more.