What do think which one is the better joiner or look up?

We can’t compare which one is a better joiner or look up because both have their own functionalities .its all depends on table size and source. If we are using flat file sorted joiner is more effective than look up because of joiner caches fewer rows .lookup caches who file in always. If we are using database lookup is effective when the database can return sorted data fast and the amount of data is small.