Intel Core i5 8265U 's Advantages
Lower TDP (15W vs 45W)
Intel Core i9 9880H 's Advantages
Released 8 months late
Higher specification of memory (DDR4-2666 vs DDR4-2400)
Larger memory bandwidth (41.8GB/s vs 37.5GB/s)
Higher base frequency (2.3GHz vs 1.6GHz)
Larger L3 cache size (16MB vs 6MB)