It goes back and forth. AMD Athlon 64 architecture was SOOOO much more power efficient and cooler than the Pentium line… then Intel came out swingin with the much faster and more efficient “Core” line. Through the i-series, they ran cooler and outperformed AMD, until about the second Ryzen generation. The top end i9s models still outperformed AMD’s high end (slightly) until the a few generations back, and now I THINK (don’t quote me on this) the top end AMD 3D processors outperform anything Intel has to offer.