Which device is better for meditators, a Garmin Fenix 6 or a brain scanner?

With meditation gamma wave activity increases in the brain as shown here in the example of Mingyur Rinpoche: But does the gamma wave activity in the brain not also incraease when practicing breath meditation down to 12 breath per minutes with a Garmin Fenix 6:? Peter Gamma from www.petergamma.org has not measured this yet, but …