Actually that is really hard to answer, because technically any steroid can be used for bulking, because in essence they all do the same thing. But if you are looking for "BULK" as in more water retention due to the estrogenic side effects then you will get more "bulk" from the Testosterones, whether they be oral or injectable. But keep in mind that a lot of this bulk is just that....Bulk. And not actuall lean muscle.