Drawback: London is an amazing country to visit, however, the only drawback is the weather.
Drawback is defined as a disadvantage or the negative part of a situation.
Counterpart: He gathered with his counterpart in order to discuss about a serious issue.
Counterpart is a person or thing that has the same purpose as another one in a different place or organization.
Another option could be to use both words in a sentence such as: The only drawback of meeting her counterpart is that he may manipulate her to lead the situation.