We can talk about who is the most famous among them in many ways. They look the same, don't they? Whenever beria Altman appears, Siro Altman will follow, which means that beria, as a villain, will definitely be defeated by Siro. It can be seen from here that their fame is almost high. In fact, I feel that fame still depends on the audience's point of view.
From the audience's point of view, I think it's still Cerro Altman. Because he is an honest Otto warrior and his performance in the plot is very good, he is also favored by Yuangu Company. His own strength is also increasing, and the scene of fighting monsters is also very shocking. There are not many Otto warriors who can compete with him now. No matter their own settings or their own strength, they are not as good as Siro Altman.
Generally speaking, all the audience have their favorite Otto soldiers in their hearts. It can even be said that neither Siro Altman nor beria Altman likes other Otto soldiers. Although beria Altman is not a decent person, there are many audiences in beria Altman. I bet that if beria is directly put on the stage now, his fame will definitely surpass Ciro.