Susan, these two guys love you. You must pick/choose one of them.
Which one is possible for this situation?
What is the nuance of 'pick' and 'choose' in such situation?
I shall prefer ‘choose’ as it means selecting the best from a number of alternatives which may be two. So choose any one of them means select the best after careful consideration. On the other hand if you are to select from a group, ‘pick’ is the right word.