Simple, Uigeadail imo. The Uigeadail is, i believe still a great well balanced and inspiring whisky (although i should add at this point that neither the Uigeadail or Corryvreckan are in fact cask strength, but "high strength"). The Corry' is not the beast it once was, and has become a little rough around the edges by Ardbeg standards, although i should point out that i believe it is still superior to the Laga 12 (which is head and shoulders above the Laga 16) as both a better whisky and a more 'natural' product (e150 free).
The Uigeadail is a better whisky than the Corry', but is more likely compared with the Laga 16, not the 12. In fact to muddy the waters the Laga 12 falls somewhere between the Oogie and Corry in impact. Maybe you should buy a bottle of both so you can answer the question For a Lagavulin lover, Corryvreckan or Uigeadail?
And then tell us what you think, apples or oranges.
(But the Uigeadail is better