We recommend genuine parts for cars and jeeps. These parts go through proper testing and meet all safety and reliability standards, however the same companies also sell the parts through a distribution network and are called OEM (original equipment manufacturer)
A number of companies design components to function the same way. In many cases OEM perform better than the genuine, because during engineering they take out the mistakes of an old genuine part. Also, internationally no warranty is void incase of using an OEM part.