I like Aubiose. As others have said, it really draws moisture downwards and keeps the surface just slightly damp. It's good at keeping smell at bay too. However, I don't find it as absorbant as Megazorb, particularly for the bunnies as I just put Megazorb straight into litter trays without lining with newspaper first. Wet Megazorb can easily be scooped out of the tray whereas the liquid seems to be running around the bottom of the tray if using Aubiose. My preference is Megazorb into 'naked' litter trays for the buns but Aubiose onto newspaper for the piggies. To be honest, both are good and if you're looking for value for money then you can't beat Aubiose.