I always have to add a drop to a cask strength whisky as without it my taste buds a very quickly overwhelmed by the strength of the alcohol. I never feel i need to add anything to a 40 - 46% abv whisk ...
I enjoy all these drams just depends on my mood which one i would choose. Having said that i particularly like the Highland Park, Glenlivet and Talisker 18 year olds.