The HTH sand looks a little big, whereas the Quikcrete sand looks a little small.Though just looking at the larger grains in the pictures posted here. A lot of those grains are much bigger than 1 mm. So I don't think the HTH sand has a #20 upper limit well enforced.
It would be interesting to know the gap size in the laterals so that we could know what the minimum size sand grain should be.
Knowing the lateral hole size and the sieve analysis should help identify which sand would be a better choice. A sand with virtually no grains below the lateral hole size would be best.
Maybe someone could ask a manufacturer or measure the gap size themselves?
One could also ask what would be the ideal sieve analysis for filter sand? The smallest particles that won't go through the laterals so that they pack tighter and filter better? A mix of sizes? Maybe a layering of sizes?
Perhaps a layer of larger grains at the bottom with a layer of smaller grains on the top? (This might work for a while, but might eventually fail if the smaller grains work their way to the bottom due to something called the Brazil nut effect).