  Prior studies of non-equilibrium dynamics using anisotropic hydrodynamics
have used the relativistic Anderson-Witting scattering kernel or some variant
thereof. In this paper, we make the first study of the impact of using a more
realistic scattering kernel. For this purpose, we consider a conformal system
undergoing transversally-homogenous and boost-invariant Bjorken expansion and
take the collisional kernel to be given by the leading order 2 <-> 2 scattering
kernel in scalar lambda phi^4. We consider both classical and quantum
statistics in order to assess the impact of Bose enhancement on the dynamics.
We also determine the anisotropic non-equilibrium attractor of a system subject
to this collisional kernel. We find that, when the near-equilibrium
relaxation-times in the Anderson-Witting and scalar collisional kernels are
matched, the scalar kernel results in a higher degree of momentum-space
anisotropy during the system's evolution, given the same initial conditions.
Additionally, we find that taking into account Bose enhancement further
increases the dynamically generated momentum-space anisotropy.
