First, sensei GoSho Aoyama will decide
Second, if I can choose, I like Shin with Ran.Many fan in my country like ShinxAi but I think if it was Shin, he will choose Ran .Because he and Ran have been friend since they were small.Ran have a warm heart, always wait for Shin. Ai is good for Shin in work.But about lover, Ran is better.We can see that Shin and Ai have many same character. So 2 people are cold live together?! So boring!