I would think Hilbert would be the lowest internal stress infill but also the one providing the least internal mechanical strength. In fact, I’m not sure how much better Hilbert would be than “hollow”. I guess it does provide vertical support to the upper layers but almost none to sideways forces?
Is there documentation somewhere which compares the different infill using the same material, and maybe stress tests them under compression, tension, side load, and so on at various infill amounts? I just use the linear or honeycomb infills because they seem to work fine, but I’m usually not building high load structural objects. Sounds like a big research project that would need some specialized tools, but it’d be interesting to see graphed results, etc.