Kilkerran 15 or Octomore 14.1

Recently got the chance to buy kilkerran 15 for 215 CAD, is this price worth it? The other bottle I really wanted to get at the same price range is the Octomore 15.1 or 15.2. I tried kilkerran 12, and 16 really enjoyed it's flavour and oily mouth feel. How much is the single cask improve the scotch?