  Supersymmetric SO(10) grand unified models with renormalizable Yukawa
couplings involving {\bf 10}, {\bf 126} and {\bf 120} Higgs fields have been
shown to give a very economical theory for understanding quark-lepton flavor in
a unified framework. In previous papers, we showed how nucleon decay can be
suppressed in these models without invoking cancellation, by choice of Yukawa
flavor texture within a type II seesaw framework for neutrinos that explains
all mixings and masses including the recently observed "large" $\theta_{13}$.
In this follow-up paper, we extend our earlier work to the case of type I
seesaw and show that the recently measured "large" $\theta_{13}$ can be
accommodated in this case while suppressing proton decay. We then point out
that the two cases (type I and II) lead to different testable predictions for
$B(\mu\to e+\gamma)$ and $B(\tau\to \mu (e) +\gamma)$ as well as different
flavor final states in nucleon decay. In particular, we find that for the type
I seesaw case, $B(\tau\to \mu +\gamma)$ can be observable while at the same
time suppressing $B(\mu\to e+\gamma)$, whereas in the type II seesaw case,
$B(\tau\to \mu +\gamma)$ is always suppressed whereas $B(\mu\to e+\gamma)$ is
observable.
