70% is wetter. Moderate and reasonable range is related to room temperature and indoor ventilation.
Generally, when the room temperature is 8- 18℃, the human body will radiate heat to the outside. If the indoor breeze blows and the indoor relative humidity is between 40% and 60%, you will feel comfortable and healthy. In the comfortable indoor temperature range, the influence of humidity on human body is not obvious. But when the temperature is 28℃ and the relative humidity reaches 90%, you will feel the temperature reaches 34℃. This is because when the humidity is high, the water vapor content in the air is high and the evaporation capacity is low, so it is difficult to evaporate a large amount of sweat discharged by the human body and the heat in the body cannot be dissipated smoothly. So, you will feel stuffy.
If the humidity in the air is too high or too low, it will cause human discomfort. Heating in winter will reduce the humidity of indoor environment. In different temperature environments, people's comfort to humidity will be different. Generally speaking, people's "tolerance" for humidity is very wide, and 30-70% people will think it is ok. However, indoor humidity is often lower than 20% in winter, which may cause skin and respiratory problems. Therefore, it is a better choice to increase the humidity in various ways and keep the humidity above 30%.