People keep throwing around the word "better", but that's not the right word. This isn't really a "better" or "worse" kind of thing. The wall connector is a variable setting kind of device. You can choose to install and configure it on many levels of circuit, like 20A, 30A, 40A, 50A, or 60A. You pick one, and you do the wire, the circuit breaker, and the wall connector setting all on that. (with the aforementioned current being 80% of the circuit rating) The word is "appropriate", not "better".