The stack of benzene molecules represents a good ground for comparison between Stochastic GASSCF, Active Space Decomposition Density Matrix Renormalization Group (ASD-DMRG), and Non-Orthogonal CI with a Reduced Common Molecular Orbital Basis (NOCI-RCMO), as the latter approaches have also been tested on the same or similar model systems in earlier works. Both NOCI-RCMO and ASD-DMRG are tailored towards clusters of molecules with weak inter-space interactions, and share the assumption that the main correlation effects happen within the fragments.