I find it hard to name a single favorite. My top choice among the smokier tipples is (for now) Laphroig Quarter Cask. However, I'm also very fond of Balvenie Single Barrel.
I was "window shopping" the Scotch aisle in a local liquor store yesterday. Saw that they now carry Yamazaki. I didn't notice the word "Scotch" on the label, they list it as a single malt liquor. At the risk of sounding heretical, I may pick up a bottle to try. Might even be good for brownie points at home, being that my bride's name is Sumiko