I prefer egg crate... It allows more water build up in the false bottom... Hydroton is heavy and has a lot of surface area (meaning you will have to drain it very often).

To hide the egg crate, I build an egg crate box that is 1/2 inch off each side and the front of the tank; I then pack black pea-size gravel around the base of the box to hide it... I think this looks nice... You can also use black contact paper on the outside of the tank to hide it... Make sure you cover the egg crate with fiberglass window screen (I don't like weed block as it tends to retain water and doesn't drain nearly as well as window screen... I always put a 1 inch layer of damp sphagnum moss over the egg crate then add 2-3 inches of ABG as substrate, then 2-4 inches of leaf litter over the ABG.