Suppose me and my friend had a discussion on a movie we just saw and I told him which is my favorite part and he told me his(it is a different part). If I need to clarify, I will definitely say 'we discussed which part of the movie is my favorite and which is his'. But I think this has too much words. Can I just simply say 'we discussed which parts of the movie are our favorite? I afraid other people may misunderstand it as those parts are both our favorites which is not the truth.