I have a lobster roach colony for feeding to my chams, but I've never had dubias, so I can't really say which one is better. I believe lobster roaches are smaller than dubias, so I think the adult lobster roaches are a more appropriate size to feed to most adult chams, whereas adult dubias are a little big for most the chams people keep. Lobster roaches can climb smooth surfaces which might make them harder to contain, but I haven't had much problem with escapees. I think as long as you give them plenty of places to hide and keep them well fed, they're content to just stay in the container. Even when I open the container, they don't try to escape much. They mostly want to run lower down in the container to hide.