Yes, 5V1A to charge the iPhone because of small power, less heat, slow charging, so the number of cycles is slower, the health decline is slower, but the battery is a consumable, as long as it is used, it will definitely decline.
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Therefore, it can be said that the 5V1A battery health decline is slower than using 20W fast charge, but it cannot be said that it does not affect the health.
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If you are particularly concerned about health and can accept slow charging, then you can use 5V1A, if you accept that the battery itself is a loss, and are willing to use a certain degree of battery loss to obtain a pleasant charging experience (several times faster than 5V1A in the top 50%), then choose 20W.
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The decline in the health of the 20W fast charging battery is relatively qualitative, which can be understood as that most people can maintain more than 80% in 2 years, if you use 5V1A, it may be more than 90%, which is probably the difference between the two, but this varies from person to person.
The charging head of Wufuye can generally charge the Apple 13, but sometimes it may not be rushed in, because they sometimes need a standard interface of their own to activate the power supply to wake up the battery.
Especially when the battery is used up, every time I think Apple's original charging head can activate the Apple battery, which should be one of its protocols.