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Both satisfy the code rule that utility and generator can never be connected at once. The comparison, what each costs you in circuits, and the two things you need on the wall either way: an inlet box and a cord.
Charging time is battery kWh divided by charging kW, plus about ten percent for conversion loss. The tables below cover Level 1, Level 2 and DC fast charging, and the three ceilings that decide which number applies to you.
NACS and CCS1 compared on pins, DC rating and protocol, plus the reason a NACS-to-CCS adapter works on V3 and V4 Superchargers but never on V1 or V2, and what actually limits the power you get.
Both outlets are 50 A and both give an EV charger the same 9.6 kW. The 14-50 has a neutral and the 6-50 does not, which decides what else the circuit can run and whether you can reuse the one already on your wall.
J1772 and NACS compared pin by pin: which cars use which, why the connector never changes your home charging speed, and exactly when you need an adapter instead of a different charger.