If you have a family, unfurnished apartments are likely the best option, since there are a much wider variety of unfurnished apartments available and they are located in quieter residential areas. Unfurnished properties are also typically the best option for a pet owner since many serviced apartments have a No Pet policy.
If you are looking for all-inclusive services such as in hotels, serviced apartments are probably more suitable for you since serviced apartments are fully furnished and provide housekeeping services.