Gargolye geckos take about 18 months to mature (if I remember corectly). It is much easier to end up with one really "buff" gargolye and one "weaker" one in a container, if the two bully and end up dropping tails. The tails will grow back, but a gecko tail seems to be rather rich in nuetrients, so if one of them is eating tails..(plus having to regrow a tail) makes a big difference.

The "morphs" for gargoyle is basically patternless (not seen as often, at least I haven't personally, but pangea reptile may not be working on that line), striped, and marbled. They also go through a slight color change..you may not have a really red baby gargoyle gecko and end up with a really nice red one later on.

Gargoyle geckos need more protein than cresteds, but the gargoyle diet is made as well.

I don't know much about viper geckos, sorry.