Intel Core i7 1260P 's Advantages
Higher base frequency (2.1GHz vs 2.0GHz)
Larger L3 cache size (18MB vs 12MB)
Intel Core Ultra 7 255U 's Advantages
Released 2 years and 11 months late
Higher specification of memory (8400 vs 5200)
More modern manufacturing process (3nm vs 10nm)
Lower TDP (15W vs 28W)