35% is probably adequate, but I really think 50% is better - for the plants, the individual and the structure.
Humidity is humidity no matter what the source. “Cool mist” types tend to be more energy efficient than warm mist ones, but the minerals dissolved in the water end up becoming deposited as a fine dust throughout the house.
Capacity is more important than type, and console type “whole house” humidifiers that blow air through wicking material saturated by capillary action might be the best.
Read
this and
this.