Foremost, MediaTek is the manufacturer of powerful and affordable Helio chipsets. MediaTek processors are usually present in some devices that are manufactured by the Chinese, and typically in Sony Smartphone. The major advantage of MediaTek over Exynos and Qualcomm is the fact that it can be obtained at a very cheaper rate and still have relatively the same performance.
However, MediaTek has been greatly criticized because it easily gets very hot. In addition, MediaTek consumes battery faster. On the other hand, the snapdragon series is well attached to the Qualcomm processors, which are reckoned with to be the best in the market presently. The best smartphones nowadays actually have the premium model present in them.
The major advantages that the snapdragon has are that it consumes less battery, stand out speed, and graphics improvement. The Chinese make use of this product in their best smartphones, which include HTC 10, Xiaomi Mi 5, Samsung Galaxy S7, One Plus 3, and LG G5.