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We propose a new paradigm in the field of black hole physics, i.e., with moreand more high precision observations, one must make a metric selection todetermine which black hole is observationally preferred. In light of the shadowimaging data from the Event Horizon Telescope and gravitational wavemeasurements from the LIGO-VIRGO collaboration, we attempt to address thisissue. Although not finding any obvious preference for a specific black holemetric based on current data, as a presentation of this new research paradigm,we rank these black hole metrics using the Bayesian information criterion. Wefind that Kerr and Reissner-Nordstr\"{o}m tie the first place in the black holeOlympics Games. Interestingly, we give the $2\,\sigma$ upper bound of theaverage electronic charge $Q<2.82\times10^{18}$ C for theReissner-Nordstr\"{o}m spacetime, and the $2\,\sigma$ constraint on the averagespin parameter $a=-0.02^{+4.07}_{-4.04}$ m for the Kerr spacetime, which isconsistent with the prediction of zero rotation for a distant observer. Futuremulti-messenger and multi-wavelength observations will enhance the applicationof this new paradigm into tests of gravitational theories and black holes.

Black Hole Olympics: Metric Selection from the Event Horizon Telescope and LIGO-VIRGO Observations