Which ever you grow, place them on the east side of your house or other structure or shrub. That way they will get only morning sun. Also, if you want them to be blue versus pink, be sure to add a bit of aluminum sulfate to the soil. There are two types of hydrangeas based upon blooming habit. Some bloom on old wood and others bloom on new growth. In zone 9 either should do well for you. Here in S.C. I have trouble overwintering those that bloom on old wood. If freezing temperatures kills that wood, then the bloom is gone for the next season. We tend to prefer the lace cap varieties to the mop heads.
This site has some good info on different types of hydrangeas