Neither Intel nor AMD is automatically best. Compare the exact processor, the laptop or desktop around it, battery or cooling behaviour, platform features and total price.
Compare the product, not just the brand
Processor families span low-power mobile chips, mainstream desktop parts and high-performance models. Two computers carrying the same processor brand can behave very differently because of power limits, cooling and memory configuration.

Laptop comparisons need system context
Battery size, display, cooling, fan tuning and manufacturer power settings can change real-world laptop performance. Compare complete laptop reviews and battery tests rather than assuming a processor specification tells the whole story.
Desktop priorities
For desktops, compare application and gaming benchmarks relevant to your use, platform cost, motherboard features, integrated graphics needs, upgrade path and power consumption. A slightly slower processor in a better-balanced system can be the smarter purchase.