Comparison Precious Cat Senior and Ultimate Cat Litter

I love crystal litter the best but am trying to make my old cats as happy as possible with their litter boxes. I have used Precious Cat Senior (PCS) before but am wondering how it compares to Ultimate Cat Litter (UCL). Has anyone used both of these and how do they compare in texture and odor control? Thanks.
http://www.preciouscat.com/precious-senior-p-12.html
http://www.ultimatepetproducts.com/