Samsung Exynos 1380 Advantages
Larger memory bandwidth (51.2GB/s vs 44GB/s)
More modern manufacturing process (5nm vs 7nm)
Lower TDP (5W vs 9W)
Released 3 years and 4 months late
Samsung Exynos 990 Advantages
Better graphics card performance FLOPS (1.126 TFLOPS vs 0.608 TFLOPS )
Higher Frequency (2730MHz vs 2400MHz)