  We compare two-moment based \emph{energy-dependent} and 3 variants of
\emph{energy-integrated} neutrino transport general-relativistic
magnetohydrodynamics simulations of hypermassive neutron star. To study the
impacts due to the choice of the neutrino transport schemes, we perform
simulations with the same setups and input neutrino microphysics. We show that
the main differences between energy-dependent and energy-integrated neutrino
transport are found in the disk and ejecta properties, as well as in the
neutrino signals. The properties of the disk surrounding the neutron star and
the ejecta in energy-dependent transport are very different from the ones
obtained using energy-integrated schemes. Specifically, in the energy-dependent
case, the disk is more neutron-rich at early times, and becomes geometrically
thicker at later times. In addition, the ejecta is more massive, and on average
more neutron-rich in the energy-dependent simulations. Moreover, the average
neutrino energies and luminosities are about 30\% higher. Energy-dependent
neutrino transport is necessary if one wants to better model the neutrino
signals and matter outflows from neutron star merger remnants via numerical
simulations.
