Ugh I imagine death is a serious competitor in a lot of different areas as I wouldn't be the first one to challenge him to a duel. I know for sure I will not be challenging with a fiddle though...

I would have to spend a bit more time on this if my life truly did rely on it, but I think the way I would have the biggest advantage would be to find something that is more possible for a human than for death. If we assume that Death can take human form and do basic human things (eating, interacting with others, etc.) then it would really have to come down to some niche thing that I am good at. Though I am not sure I am really good at any niche skill. Maybe challenge him to a 1-on-1 call of duty game with best of 3 or something like that. But I am not really very good at that game either, but I figure he probably does not know the maps and has little experience playing video games so I think that would give me the edge.