It's a difficult question to definitively answer, as both Sherlock Holmes and Hercule Poirot are highly intelligent fictional detectives with exceptional deductive and analytical abilities. Here's a comparison of their intelligence and crime-solving skills:

Sherlock Holmes:
- Created by Arthur Conan Doyle
- Known for his keen observational skills, vast knowledge, and ability to make astute deductions
- Excels at logical reasoning, forensic analysis, and using scientific methods to solve cases
- Often described as having a "superior" intellect and being at the peak of human mental capabilities

Hercule Poirot:
- Created by Agatha Christie
- Renowned for his "little grey cells" and meticulous, methodical approach to solving crimes
- Highly intelligent, with exceptional powers of observation, intuition, and deduction
- Specializes in psychological analysis and understanding human nature to solve cases

Ultimately, it's difficult to say definitively who is smarter between the two. They each possess exceptional intellectual gifts that are suited to different approaches to crime-solving. Many readers and fans have debated this question over the years, and reasonable arguments can be made for the superiority of either detective's intelligence. It likely comes down to personal preference and interpretation of their respective skills and methods.
