Well I dont have to say it but i will: Starbound is still in beta, so its far from finished, so comparing it to a game that is fully finished is kinda dumb
Also, terraria is more "in depth" with worlds simply because you stay on one world. Starbound has lots of bland worlds with a stuffty underground because you can visit many different kinds of planets. Thats where you adventure in Starbound, where Terraria's main adventure aspect is revolved around the underground.