Intel Core i5 8265U 's Advantages
Lower TDP (15W vs 25W)
AMD Ryzen 7 5800U 's Advantages
Released 2 years and 5 months late
Higher specification of memory (4266 vs 2400)
Larger memory bandwidth (51.2GB/s vs 37.5GB/s)
Higher base frequency (1.9GHz vs 1.6GHz)
Larger L3 cache size (16MB vs 6MB)
More modern manufacturing process (7nm vs 14nm)