With a DC charging motor, you need to be sure the battery set is sized for it's capacity.
With an AC charging motor, you can't charge the breaker when station power is not available. However, if station power is not available, it's either during construction, a failure in the substation, or because of a larger outage.
A DC charging motor seems more convient, but most people don't take the time to understand the additional cost. The additional cost is in the form of possible larger battery needed, possible larger battery charger, effects of added noise on the DC bus.
A AC system may require you to evaluate the AC power for the substation, and maybe add additional backup sources for certion outage contengecies.
Either way some thinking should be involved.