Quite clearly Liverpool.
We have more trophies than you.
We have also dominated both domestically and in Europe. United have had a period of domination in England, but considering the amount of times they qualified for the biggest prize of all when under Ferguson, their record at the highest level is not good. Liverpool are European Royalty, and head and shoulders above United on the biggest stage. We are both pretty much neck and neck when it comes to title wins domestically.
Overall, Liverpool are clearly ahead. As I said, we have more trophies than you.