That's a complex one: obviously the Bybees are expensive but their benefits go beyond what the Steins can do. Other than removing treble hash and better resolution they give the music flow. I think it comes down to a much better capture of leading edge impulses (zap) and decay (reverb). The Bybees are expensive but in a resolving system downright irreplaceable. While the Steins do a good job at removing hash and improving resolution they actually benefit from being combined with the Bybees in a 1+1=3 way. To make the thing downright confusing WA speaker chips and Audioquest ground controls do their own thing in addition to the other two, all good but obviously at risk of being seen as over the top;-)
