Birds of a Feather Flock Together, but Opposites Attract

They say that opposites attract. They also say that birds of a feather flock together. When broken down in terms of what they mean, you get a bit of more understanding of what they both mean. They both are related to relationships between the people and why they connect, but they deal with different type of relationships.

When you hear "Bird of a feather flock together", you think about friendships. They say people of a
similar nature who share a similar personality will always find each other. This idiom has some truth behind it. People do choose friends based on traits that they mutually share. But the one thing to wonder is, can you really base how a person is by the company they keep. Can a person be completely different than their friends but yet still enjoy their company? It can and does happen. Just because someone has a friend with foolish tendencies, does not mean they will too. 

When they saw opposites attract, they most likely are referring to a romantic relationship. People say
that people of different qualities attract someone that is opposite of them. The idiom is a reflection of two magnets. Poles of the opposite field attract each other. The positive attracts the negative and vice versus. This is used to show how and why odd couple are created. How people of two different backgrounds, etc. can come together and form one couple.

Each phrase holds some truth. And each one holds its falsities. It is also seen how they relate and how they are used opposingly. It all depends how the person is using the phrase.