Spa
A spa is a place where people usually go to rest and relax.
There is comfort, service and a ready-made environment.
Smoke sauna
A smoke sauna is old, with sooty walls, and unfinished. Nothing points to outward beauty.
There is no service, luxury or comfort here. There is no person to guide you or to create the experience for you.
In a spa the emphasis is mostly on the outer. In a smoke sauna it is on the inner. Nothing is promised or guaranteed.
Why this matters
If you come here expecting someone to create an experience for you, you will be disappointed, because nothing is done for you here. The best way to come is without expectations.
A smoke sauna is not better than a spa. It is simply different.