What is better a sauna or a steamer?

Yes. Steam baths and saunas do help with fighting a cold. The reason being that they help raise body temperature and therefore kill some of the cold. As well, sinc you are sweating a lot, you need to drink plenty of water. This flushed out your system and helps fight off a cold. Steam baths also help increase blood circulation and improve your immune system, definite plus for fighting a cold.