Intel Core i9 13900H's Advantages
Integrated graphics card
Newer PCIe version (5.0 vs 4)
Higher base frequency (2.6GHz vs 1.5GHz)
Larger L3 cache size (24MB vs 10MB)
Intel Core Ultra 5 115U's Advantages
Released 11 months late
Higher specification of memory (LPDDR5X-7467 vs LPDDR5-6400)
Larger memory bandwidth (120GB/s vs 89.6GB/s)
More modern manufacturing process (7nm vs 10nm)
Lower TDP (15W vs 35W)