  We compute next-to-leading order (NLO) corrections in the \epsilon-regime of
Wilson (WChPT) and Staggered Chiral Perturbation Theory (SChPT). A difference
between the two is that in WChPT already at NLO, that is at O(\epsilon^2), new
low energy constants (LECs) contribute, whereas in SChPT they only enter at
O(\epsilon^4). We first determine the NLO corrections in WChPT for SU(2), and
for U(N_f) at fixed index. This implies finite-volume corrections to the phase
boundary between the Aoki phase and the Sharpe-Singleton scenario via
corrections to the mean field potential. We also compute NLO corrections to the
two-point function in the scalar and pseudo-scalar sector in WChPT. Turning to
SChPT we determine the NLO corrections to the LECs and their effect on the
taste splitting. Here the NLO partition function can be written as the leading
order one with renormalized couplings, thus preserving the equivalence to
staggered chiral random matrix theory at NLO for any number of flavors N_f. In
WChPT this relation only appears to hold for SU(2).
