  We study the impact of the measurements of three sets of observables on the
parameter space of the constrained minimal supersymmetric Standard Model
(cMSSM), its slightly general variant, the non-universal scalar model (NUSM),
and some selected benchmark points of the 19-parameter phenomenological MSSM
(pMSSM): ($i$) the direct measurement of the Higgs boson mass $m_h \approx 125$
GeV at the CERN Large Hadron Collider (LHC); ($ii$) $Z$ boson decay width in
the $b \bar{b}$ channel normalized to its hadronic width ($R_b$), and the
forward-backward asymmetry on the $Z$-peak in the same channel $(A_{\rm
FB}^b)$; and ($iii$) several $B$-physics observables, along with $(g-2)$ of
muon. In addition, there are constraints from non-observation of superparticles
from direct searches at the LHC. In view of the recently re-estimated standard
model (SM) value of $R_b$ with improved higher order corrections, the measured
value of $R_b$ has a 1.2$\sigma$ discrepancy with its SM value, while the
corresponding discrepancy in $A_{\rm FB}^b$ is 2.5$\sigma$. MSSM contributions
from light superpartners improve the agreement of $R_b$ but worsen that of
$A_{\rm FB}^b$. We project this ($R_b$-$A_{\rm
  FB}^b$) tension {\em vis-\`{a}-vis} the constraints arising from other
observables in the parameter space of cMSSM and NUSM. We also consider a few
well-motivated pMSSM benchmark points and show that pMSSM does not fare any
better than the SM.
