1, the charging speed of 20w fast charger is about 11% faster than 18w fast charger.
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The maximum output power of 18w fast charger is 18w, and the maximum output power of 20w fast charger is 20w. Charging a mobile phone that supports the fast charging protocol with the same battery capacity, the 20w fast charging speed is about 11% faster.
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2, 20w fast charge price is more expensive than 18w fast charge price.
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For example, the millet USB charger fast charge version (18w) is about 30% cheaper than the millet Type-C charger fast charge version (20w).
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Summary: Although the 20w fast charge is more expensive than the 18w fast charge, the charging speed is faster. With the advancement of technology, the charging speed of mobile phones will be faster and faster. It is recommended to buy 20w fast charge first. After all, a charger can last for years.