Agree with you fully! I love myself a Poirot story every few books. Books with Ariadne Oliver are the funniest.

I would also recommend Sherlock Holmes, if you haven't read them already. Christie mentioned SH and Watson as her inspiration for Poirot and Hastings.

The key difference is that Christie has murders invariably, whereas many SH stories have victimless crimes, even crimes that aren't clearly crimes by law. It makes it even more fun to solve such mysteries.