Always paper charts.
I have a plotter, and use it, but study the proper paper chart and can recall most of the major details, so if the plotter goes down, i can remember most of the paper chart, and can refer to it if necessary.
On my brand new all singing and all dancing large expesive ship, we have a full worlwide coverage or electronic charts on 30inch plotters, but i still prefer to use the paper charts for passage planning and navigation. They will never go wrong, or break down, give a much better bigger picture, and in some places better detail, and are re assuring to use!
Gary