It's the opinion factor...

I omitted some of my favorite individual 'singers' in this case. I'm a HUGE Oscar Brand fan, and he does numbers that would blister just about anyone's paint. I also love Tom Lewis, but he does pretty much only original numbers... same with Stan Rogers.

That's why rather than calling any one set the 'best', I think I'd call them 'really damn good'. It doesn't take away from the percieved quality of the sets, but it also leaves room without denigrating the other discs...

M