Is the S&P 500 truly superior to the FTSE 100? The answer isn't as straightforward as it seems. While the S&P 500, comprising 500 of the largest US companies like Nvidia, Apple, and Tesla, boasts a century of impressive 10%-11% yearly returns, the FTSE 100, featuring UK giants like Shell, AstraZeneca, and HSBC, has also shown its mettle. The divergence in their fortunes can be attributed to the tech boom, with the S&P 500 hosting the world's top tech firms, while the FTSE 100 lags behind. However, a closer look reveals a more nuanced picture. In the early 2000s, the FTSE 100 outperformed, and the S&P 500's dominance is more recent. The question remains: is the S&P 500's supremacy undeniable? Not quite. The future is uncertain, and a balanced approach is key. With the rise of investing apps, investors can now access both markets from their iPhones, including Apple, the tech giant driving the S&P 500's success. Yet, Apple's future isn't guaranteed, and its recent controversies raise questions. The tech landscape is ever-evolving, and the S&P 500's dominance may not be eternal. So, is the S&P 500 the clear winner? The answer lies in the eye of the investor, and a diversified strategy might be the wise path forward.