Well. I'm not entirely sure how I missed this comment for a whole year? I think they are both unique enough to be viable, and this game is at a playable state at the moment- I've just been workshopping and rewriting parts as I have the time.
I think Spirits and Glamour overall is easier to run, while Soul and Bone has a little more mechanical depth, but as a result has more to sink your teeth into! Up to you if you want a more freeform or tactical experience.