MediaTek Helio A25 Advantages
More modern manufacturing process (12nm vs 14nm)
Released 2 years and 7 months late
Samsung Exynos 8890 Advantages
Better graphics card performance FLOPS (0.2496 TFLOPS vs 0.0416 TFLOPS )
Larger memory bandwidth (26.82GB/s vs 13.9GB/s)
Higher Frequency (2300MHz vs 1800MHz)