Dimitri's employee termination was a deliberate, planned thing. He did the deed in a secluded place where there were not likely to be any witnesses and he disposed of the body immediately.
Jerry's garroting of Adam was a spur of the moment thing. While it was not planned, Jerry was prepared to act and carried a silent weapon, not just a gun. His planning came after the deed -- how to deal with the body (both immediately and long term) and what to do about any possible witnesses.
I would say that the two different situations permitted more premeditation in one case but required more passionate action in the other.
Is there a prize?