AMD Ryzen 7 PRO 8840U's Advantages
Released 2 years and 3 months late
More modern manufacturing process (4nm vs 6nm)
Lower TDP (28W vs 35W)
AMD Ryzen 9 6900HS's Advantages
Integrated graphics card
Higher specification of memory (LPDDR5-6400 vs DDR5-5600)
Newer PCIe version (4.0 vs 4)