Is Exynos 7870 Good. Exynos 9 Series. Another difference is that MT8735 has 4 more core than Exynos 7 Octa 7870.

It has 8 cores Cortex-A53 at 1600 MHz. SD 625 vs EXYNOS 7870 image source- GOOGLE. The best processor manufacturing company is Qualcomm but the Best Smartphone manufacturing company is SAMSUNG and Exynos processors are used in almost Samsung devicesYou can compare between two processors.
Well Snapdragon 625 and Exynos 7870 both are budget segment processors which are made by Qualcomm and Samsung respectively.
This is rather an incomplete question. The GPU is also a pretty mid range GPU being a Mali-T830 MP1 GPU. Here Exynos 7 Octa 7870 is 18 better than MT8735 in terms of CPU frequency. This CPU does not have a secondary processor so it will be for your more low end mobile phones.
