The iPhone 11 fast charge supports about 22W, but considering the following points, 20W is still recommended.
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Since the iPhone 12 does not send charging head, Apple has changed the whole series of iphones to not send charging head, and now various manufacturers are more in the production of 20W charging head, 18W is generally the previous series, so 20W choking flow
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Although 20W is not much faster than 18W, it can still be a little faster
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If you want to match MagSafe in the future, 20W output power is also more appropriate
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If you buy Apple's official, 20W is ￥149, but 18W is ￥243, obviously 20W is more cost-effective.
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Therefore, based on the above, it is recommended to buy 20W.