Drinking Scotch is a bit rare for me these days, although I still have a wee dram on occasion. A couple of years back, when I was drinking Scotch regularly and thought, erroneously, that no bourbon was equal to good Scotch, I would have said that no blend is as good as a Single Malt.
After getting my come-uppance with saying something is 'best', I don't like to make categorical statements about any spirit. That being said, in my experience, I do find that the nose on the Single Malts seems to be a bit fuller and more complex than most of the blends.
But I have done little in the way of comparison except the offhand tasting of Chivas, The Famous Grouse, or Johnny Walker against some Single Malts.
The Single Malts always seem to come out on top for me. I like their individual charaters. Among the blends, I am most willing to buy Johnny Walker Black and actually prefer it to the Blue, that little touch of sweetness makes it better for me. That it is reasonable adds to the attraction of JW Black.
Do not go gentle into that good night,
Old age should burn and rage at close of day;
Rage, rage against the dying of the light. - Dylan Thomas