Theoretically speaking, Huawei mate 9 uses 4.5v/5a super fast charging, which can reach 22.5w, while oppo flash charging uses 5v4a, which can reach 20W. Theoretically speaking, Huawei mate 9 uses faster super fast charging than oppo flash charging.
In fact, the difference between them is not too much. Both of them are low voltage and high current for fast charging, while high voltage and low current for high power are used by Qualcomm and MediaTek.
From the safety point of view, fast charging does not damage the battery, and there is no one who is not safe. And the most important thing is that the manufacturer guarantees the quality of the quick charging process.
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