In a commercial parking facility, the choice between AC and DC charging depends less on the technology itself than on the average time a vehicle stays parked — and that varies enormously between a shopping mall, an office building, or an airport.
When the average stay exceeds three or four hours — offices, long-stay airport parking — AC charging is usually sufficient, and notably cheaper to install across multiple spaces, since it doesn't require as large an electrical supply.
When the average stay is short — an hour of shopping, a meal, a quick errand — only DC charging lets the user recover a meaningful amount of range in that window. Installing AC in that context often just means parking spaces occupied by vehicles that barely gain any range.
In practice, the solution that works best in large parking facilities is usually a mixed approach: most spaces equipped with AC charging for long stays, plus a small number of high-turnover DC charging spaces near the entrances, reserved specifically for fast, short-duration charging.