How To Tell Which Apple Charger To Use With Your iPhone/iPad/iPod/Watch
A dozen USB chargers in the lab: Apple is very good, but not quite the best
The iPhone 8 and iPhone X will support fast charging, but only over USB-C - The Verge
Daring Fireball: Third-Party USB-C to Lightning Cables Might Come in Mid-2019 (Which Is Good, Because I Still Don't Think iPhone Is Ever Going to Switch to USB-C)
iPhone XR, iPhone XS charging slowly? Using a different charger can help ... - 9to5Mac