Usually I'd agree, but in this case (unlike Sea Change, where the options are DSD (SACD) or PCM transcoded from DSD (DVD-A, Blu-Ray) with a negligible difference in sound quality) there are two different source tapes at play and two very different mastering approaches.
Put me firmly in the camp who prefers the Blu-Ray version. Before I got it, I saw some waveforms illustrating the differences between the two versions and when I saw that the Blu-Ray had considerably more bass and treble I kinda winced and thought "great, another super-hyped smiley-face EQ modern mastering" but it turns out it's not the case at all. I guess it's no surprise that Bruce Botnick (who mastered the Blu-Ray) has an ear for this music given that he engineered the original recordings (and the quad mix) but the added extension in the bottom and top end is a very welcome addition, and far more judicious than any waveform or frequency plot would indicate - there are no sizzling hi-hats or thumping sub-bass to be had, just enough "juice" to make these old tired recordings sound exciting again, for me anyway.
I really hope that if Rhino do any more quad on Blu-Ray, that they might consider using Botnick as a mastering engineer over Craig Anderson - I love everything about the Chicago Quadio box except for his mastering.