What is the best reply to this question, "Why should we hire you?"

The best reply to this question is a story.
A story about your strengths and achievements, and what truly makes you stand out from the crowd.
Here you should be as specific as you can by showing that you have the skills needed for the job and clearly stating your interest in the position.

because you are a driver of car and we are car's wheels

If you are standing against best tasty chocolate cake at sweet shop which you can afford, would you just leave such a splendid chance just because of confusion...ohhhh NO...have it at earliest as you can...! That's what I'd suggest to employers...

I think that you should try to point put your strength to interviewers.
If it is a marketing jb , I think that you should point out that you are a very good negociator , easily adapts to changes , linguistic capabilities , and fast learning abilities