The provided benchmark tests three different ways to calculate the result of 71^3 in JavaScript:

1. Exponentiation (**): This is the built-in operator in JavaScript for exponentiation. It's used as y = 71 ** 3.

Pros: Fast and efficient, directly implemented in the JavaScript engine. Cons: May not be optimized for all browsers or devices.

2. Explicit Multiply (* * *): In this approach, we calculate the result by multiplying 71 with itself three times: z = 71 * 71 * 71.

Pros: More readable and maintainable code, allows for easier debugging. Cons: Slower than exponentiation due to repeated multiplication.

3. Math.pow() function: The Math.pow() function takes two arguments: the base and the exponent. It returns the value of the expression base ^ exponent. In this benchmark, it's used as x = Math.pow(71, 3).

Pros: General-purpose function for calculating any power, can handle fractional exponents. Cons: May be slower than exponentiation due to additional overhead.

The choice of approach depends on the specific use case and performance requirements. If speed is critical and readability is not a concern, using the built-in exponentiation operator (**) or Math.pow() function may be the best choice. However, if code readability and maintainability are important, using explicit multiplication with three multiplies (* * *) might be a better option.

It's worth noting that the benchmark results show Chrome 93 on Chrome OS 14092.77.0 executing each test case at different speeds, which indicates potential browser or device-specific performance variations.