What kind of humidifier is good for getting rid of freq stuffy nose?

Don't know if it can. A humidifier has benefits in the winter when the heater/furnace is used.Without the humidifier, dry heat can cause headaches, sore throats, congestion from dehydrated airways. The house humidity can drop <10% without help. If the humidity >60% , like your shower stall, you may increase mold growth and create problems from the excess.I've never rec humidifiers for a runny nose, doubt any benifit.
Cool mist humidifier. May prove helpful in a dry environment. I do not recommend warm mist humidifiers or those with additives.