i've used play sand in a couple of my tanks - one 55 gallon and a 20 long. the two tanks had different bags of sand in each, and i was not happy with the sand in the 55! diatoms everywhere, all the time, and the oscar housed in that tank would move the sand around into a pile and it would turn black quite quickly, even with me stirring it and spreading it back out over the tank bottom every water change (or more frequently!).
the 20 long on the other hand...... i'm in love with the sand in that tank! no diatoms whatsoever, no black sand 'pockets' even when i forget to give it a stir, and my swordplants are happy as pigs, sending roots all across the place (most likely the reason for no black pockets). what i do when i'm scraping the tank glass clean is use the plastic card (i use a tim hortons card because i'm Canadian, hahaha!) and 'chop' the sand in places where the sword roots aren't too plentiful. works great, and there's no sand cloud in the water from stirring.
if you go with play sand, give it multiple rinses before adding it to the tank. play sand can have a lot of silt in it, and you want to ensure you get as much of that out as possible. heck, i rinsed the sand so good when i put it in the 55, i did it with fish in the tank and the water was clear within hours.