Hello all, I was wondering if someone can help me? I am going for a second round of interviewing for a pharm rep job next week and I was wondering if you can tell me the differance between Diovan and Micardis?

I know that Atacand, Avalide, Avapro, Cozaar, Hyzaar and Teveten are all competors. I am applying to be a rep for Micardis and my interviewer specifically mentioned Diovan as their competitor. I am wondering why Diovan has 60% of the market share and Micardis has only 4%? Can someone help me please? Thanks alot, I am new to this site but am hopeful in my new career I can be more aversed to healthcare advances.