I think either lilac will perform about the same. The cold zone range is not really a factor when you get to the lower end of the range. It is heat zone that matters in this case. You are in heat zone 9 and the lilacs are generally rated to about heat zone 8. Thus they will really suffer in your long hot summers. To give your plant its best chance provide morning sun and afternoon shade. Mulch the soil surface and keep the soil moist without overwatering as good drainage is important.
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