I would actually say, it really depends on what is being done, and what your budget it.
In general, treatments at clinics would cost most per session as there also involves a medical consultation. The medical-grade machines would in some cases result in fewer sessions needed.
Some spas/beauty salons can provide good treatments, as repeated treatments (albeit in weaker energy settings) in the hands of good therapists can get great results with lesser cost.
Basically what I am saying is - it depends on who and where you go to, rather than saying simply that CLINICS is always better than SPAS.
