I find the 15 year to be the most enjoyable. I have some 20 year but with it cut to 90.4, I really don't find it very compelling. The 23 year has been hit or miss. I have a 23 year that was a private barrel purchase that is quite nice but other 23's I've had are overly woody so if you like a woody profile, then you may love it. The 15 to me is the most balanced.