..."the dissonance is sweeter and its resolution less clear and clean-edged" ...

Pace M.Ted's eagle-eyed swoop on "dissonance", that is a fairly evocative description of the effect of Gmin v Bflat.

My feeling is that the lack of clarity and clean-edgedness in the Gmin actually suits the world-weary feeling of the song better than the more assertive, "wake-up" impact of the BFlat.

But hey, as you say, it's all about opinions. One thing for sure however, there is no place for a BFlat minor chord there ...