A proper paper diary is silent and unobtrusive in use; it has no batteries to go flat; it doesn’t break if you drop it or tread on it; it helps you remember things because you have actually written them down; you can write in it during meetings and so on (when your smart phone will be outside or turned off!); and things don’t get mysteriously deleted. There is the risk of losing your paper diary of course, which is something to bear in mind.
When you are getting your next diary, planner or calander please choose a British made one. Before buying, check the inside or back cover and see where the diary you are looking at is actually made (printed and bound).