I am trying to model systems with hydrogen bonding interactions of heavy in which the acceptor is an ion like chloride or bromide. Which level of theory, among B3LYP-D3 and MP2, will be better for modelling the interactions, especially in terms of geometry and energetics? You may also suggest levels of theories which takes comparable time, but yields a better result.

P.S.: Although chemical systems are modelled the best using CCSD(T) - the gold standard, but due to large system, the CCSD(T) will be too costly for me.