I am of an age that prefers paper to screens. What if the boat electrics earth falls off and all the instruments suddenly stop working, which did once happen to me? Or the battery in your hand-held GPS is flat. One has to have some sort of paper although I can detect deterioration in my own traditional navigational skills as I rely more and more on the chartplotter. However, I confess that, because it is so much more convenient than rolls and rolls of paper, I do frequently consult the Navionics charts on my computer at home, for winter dreaming and planning. And these days on my iphone when I'm sailing. Of course, paper is so much nicer to handle both at the chart table and in the cockpit, but it's expensive — at least the Admiralty charts that I have bought over the years are. But you don't these days have to have a huge collection of standard charts of the sort used on battleships, but rather small craft charts for the main cruising areas around the UK — Folio SC5611 'West Coast of Scotland: Mull of Kintyre to Point of Ardnamurchan', which covers almost all the anchorages on this website, plus Folio SC5616 'West Coast of Scotland: the Point of Ardnamurchan to Shiant Islands' which covers the rest. I am not an Imray Charts person for no very good reason other than I started off with Admiralty charts and like my bank haven't changed my habits. At least not until I left RBS in disgust (remember Fred the Shred?) and moved to the Co-op following the financial crisis in 2009, and then again when the Co-op came under a cloud, to the only mutually-owned building society in the UK, the Nationwide.
You should also buy (at very modest cost) the Antares Charts, unofficial but brilliant very large scale small-area electronic charts with related pilotage information. They were created by Bob Bradfield, a retired investment banker, who has been cruising round the West Coast for years, these days on a motorboat called 'Otter' (even though he lives in Essex). And he is constantly extending and updating them. I don't approve of the honours system except for MBEs, and Bob has one of those for his hydrographic efforts — so very well deserved. He has produced charts of places which may not have been surveyed for years, particularly many of the more interesting and intricate anchorages. Highly recommended.
As for maps, you can't do better than the Ordnance Survey maps of the area, on paper or on your phone — brilliant.