The answer lies in whether or not the base course of your parking lot remains in good condition.
If your parking lot has been deteriorating prematurely after several attempts of hot-mix asphalt resurfacing, it is likely that you have a problem with the foundation. In many instances, pavement deterioration occurs in only the top 1 or 2 inches of the asphalt. In that case, Asphalt Milling might be a good choice and will help to save you a lot.
Asphalt milling is a process in which a large capacity grinder is used to remove only a layer or two of existing pavement prior to re-surface or overlay. This is a cost-effective alternative to a complete removal and replacement.