Hardwired vs plug-in installation
A hardwired charger is permanently wired to its circuit; a plug-in charger connects to a 240 V outlet. Hardwiring supports higher amperage (above 48 A it is required) and is more weather-robust, while plug-in units are portable and easier to replace.
The US National Electrical Code caps plug-connected chargers at 50 A circuits in practice, which is why 48 A+ models are hardwire-only.
Many chargers ship in both variants or convert between them. If you rent or may move, plug-in has obvious appeal; for maximum charging speed, hardwired wins.