Samsung Exynos 990 Advantages
Better graphics card performance FLOPS (1.126 TFLOPS vs 0.621 TFLOPS )
Larger memory bandwidth (44GB/s vs 18.4GB/s)
Higher Frequency (2730MHz vs 2400MHz)
MediaTek Dimensity 900 Advantages
More modern manufacturing process (6nm vs 7nm)
Lower TDP (4W vs 9W)
Released 1 years and 7 months late