Correct! Sauna is better by far. What you think of as sweat from steam is merely condensation. Why do you think the walls are wet? From sweating? Steam burns the skin more so you can't stay too long AND it has same conditions as a rain forest where bacteria thrives.
Sauna , on the oter hand , bakes you from inside out. You really sweat, releasing toxins from inside the body. It takes more time. Bring a book. Relax. Show how intelligent you are.
If you use steam make sure they are cleaned often, maybe every 2 hrs. God knows what the last guy had on this ass.