Their care is almost exactly like cresties. The main differences are: adult gargs cannot stick to glass due to their bulky size so they need more branches & vines to climb; and they are more aggressive so they need to be housed individually if you want them to keep original tails (if you do house pairs, make sure they are same size or the larger one can kill a smaller mate/roomie).
I personally think that gargoyles have more personality & tolerate handling much better than cresties do.