Charging

There is no best. The fastest, if speed is important, is the Apple 20 watt (or higher) USB-C adapter. Note that higher than 20W will not be any faster than the 20W, but if you have one (say, for a new MacBook) it is safe to use it.

The most convenient is a Qi wireless charger or an Apple MagSafe wireless charger; neither will be as fast as the 20W USB-C, but they won’t be much slower.

Note that you can use other manufacturer’s chargers, as long as they are certified Made for iPhone (MFI).

If you charge overnight, every night (and it is a best practice) you probably won’t need a fast charger. The phone will be at 100% in the morning, and it will probably last all day unless you are a very heavy user.