Intel Core i7 1355U's Advantages
Integrated graphics card
Higher base frequency (1.7GHz vs 1.5GHz)
Larger L3 cache size (12MB vs 10MB)
Lower TDP (12W vs 15W)
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)
Newer PCIe version (4 vs 4.0)
More modern manufacturing process (7nm vs 10nm)