Attempted murder is worse than murder, Eddie, in many cases. To be guilty of murder, the accused need only to have intended to cause grievous bodily harm to the victim, To be guilty of attempted murder, the accused must be proved to have intended to kill the victim. It would follow that some attempted murders should be visited with more severe sentences than some murders, the only mitigation, if it can be called that, being that the attempted murderer didn't manage to achieve what he fully intended, probably because he was thwarted by the skill of doctors.
The law, however, makes life the mandatory sentence for all murders but, as we all know, a distinction is drawn between different kinds of murder, in setting different tariffs of minimum years.