Intel Core i3 9100T 's Advantages
Better graphics card performance
Higher base frequency (3.1GHz vs 2.6GHz)
Lower TDP (35W vs 65W)
Intel Core i5 11400 's Advantages
Released 1 years and 11 months late
Higher specification of memory (DDR4-3200 vs DDR4-2400)
Larger memory bandwidth (50GB/s vs 37.5GB/s)
Newer PCIe version (4.0 vs 3.0)
Larger L3 cache size (12MB vs 6MB)