Intel Core i3 6100 's Advantages
Higher base frequency (3.7GHz vs 3.5GHz)
Lower TDP (51W vs 60W)
Intel Core i3 12300 's Advantages
Released 6 years and 4 months late
Higher specification of memory (4800 vs 2133)
Larger memory bandwidth (76.8GB/s vs 34.1GB/s)
Newer PCIe version (5 vs 3.0)
Larger L3 cache size (12MB vs 3MB)
More modern manufacturing process (10nm vs 14nm)