I like the the eco-earth but the climate here is very dry so I have to keep it constantly moist to keep the humidity right. This is a good thing for feeding in the tank as the puffball dryness will easily attach to their food if it isn't moist. I'm not saying mud-like but moist.

It doesn't get moldy when kept moist, helps keep humidity up and looks nice IMO. I used to use aspen but I like the eco-earth better. My preference.