Which is Better?

[jwise]

For those of you who have had both, which is better?

The Balvenie:
12 yr Signature v. 15 yr Single Barrel?

Glenfarclas:
15 yr (Europe) v. 17 yr (U.S.)?

Full-power sherry bombs:
Glenfarclas 105 v. Macallan Cask Strength v. Aberlour A'Bunadh?