There are a good amount of data-sets in here which show a higher value would be better for low and critical: Foxtech 30000mah 6S Battery, any one try it? - #28 by mtfunder. I target around 20% remaining and 10% remaining for low/critical (which I think is fairly standard).
The main reason behind buying the LiPoSS (from my point of view) is the high energy density paired with a fairly high (5C) c-rating. However, I don’t have enough flight time on them to fully trust for some of my more commercial projects (so take this all with a grain of salt).