which charger is best for iphone 11 5 W normal or 18 w fast ?
which charger is best for iphone 11 5 W normal or 18 w fast ?
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Depends on what you consider "best" to mean. If you mean which will allow your iPhone to charge the faster, then it would be, at least, the 18W power adapter.
The support article you arrived here from should have already provided you with this information:
Testing conducted by Apple in August 2019 using preproduction iPhone 11, iPhone 11 Pro, and iPhone 11 Pro Max units and software and accessory Apple USB-C Power Adapters (18W Model A1720, 29W Model A1540, 30W Model A1882, 61W Model A1947, and 87W Model A1719).