Do you think good communication or good chemistry is more important in a relationship?
Communication is the key ingredient to a compatible relationship. with out communication then things will either slowly fall apart or rapidly fall apart depending on the people involved.
Communication will build up trust between the two individuals and allows them to see eye to eye in their relationship.
Even though chemistry is a good thing but you do have to remember that people do change but if you have good or great communication that person will not change when they are with you.