In my infinitesimal research time today, Bovy and I discussed the dynamical measurements of the black hole at the Galactic Center. It appears that received wisdom is that by far the best measurement of its mass comes from the one closest star that has completed a full orbit in the 15-or-so years in which it has been observed, and all other measures are deprecated to that one. It also appears that the central mass estimate has creeped upwards throughout that time, so there are unresolved discrepancies among different data sets. Joint analyses of all the data available have not been attempted, to our knowledge.
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