I've seen that chart before and it's pretty good on flavor grouping. The old approach of classifying whisky by region just doesn't hold up any more (if it ever did). A great book with a similar approach is David Wishart's Whisky Classified (choosing single malts by flavour). It's based on grouping whisky into 10 clusters based on the presence/strength (or lack thereof) of 12 flavor elements (Body, Sweetness, Smoky, Medicinal, Tobacco, Honey, Spicy, Winey, Nutty, Malty, Fruity, Floral).
My whisky preferences are pretty eclectic. I love the big sherry bombs and the Islay peat monsters, but also really appreciate some of the more delicate whiskys at the right time. Hard to pick one overall favorite, but Highland Park is right up there. My current go-to bottle is a cask strength Isle of Arran, the 14 yr Sherry Cask.