The problem with this example is that bodies and such aren't so much an indication of presentation quality as they are the presentation itself. Corpses, discussions regarding death and the like are merely ways which the writers use to get the message across to the viewers that a death has occurred; they don't necessarily represent the writing quality itself. A death with all of those dark elements can still as easily be mishandled, and a death without any of those elements can just as effectively get its' message across to the viewers via good, fluent writing.Generally speaking, a kid's show has a simpler presentation of its contents. There's usually very little foreshadowing and subtext, plot points are explained and there's far less left to interpretation from the audience. Also, there's the highly structured nature of the narrative, which makes the show a lot easier to watch.
To give an example for the how presentation and execution is different: compare how Pokemon handled Stoutland's death to, say, how a Shonen show like Naruto or One Piece handled a death. Note how in Pokemon, you never see a body, nor is the word death explicitly mentioned or discussed.
The quality of the execution hinges on how competently the writers integrate the implications behind that death into the show, rather than how they portray the death itself. For example, how will this death affect the narrative in the long run? Can it be tied into another on-going plotline, or should it be left a stand-alone event? Are there any hidden meanings behind it that can be used to add substance to the plot? These are all the questions that the writers must ask themselves in order to make the most out of that death; it doesn't have anything to do with the elements which the writers choose to portray it with (i.e. Corpses, dark atmosphere etc. or not), hence it is entirely possible for both medias to handle death in a way which is satisfying to the viewer regardless of age (unless if the viewer specifically wants dark elements integrated into the plot).