Its good to get differing perspectives from patients, and also to get a feel for outcomes. Even though the majority do posterior, most can explain why they do it the way they do. Dr. Gross liked posterior because he felt that he could reproduce good placement easier that way. Others may prefer one of the other methods (Anterolateral, Direct lateral, Sliding Transtrochanteric, and Direct Anterior). I don't know enough detail on the other methods, but can say that my doctor's description of his method and why he chose it swayed me all the way.
I would keep others' opinions in mind, and get all the information that you can, but lets face it, if you have chosen an experienced doctor, with a good track record of results (which he can and should provide), then what works for him will probably work well for you and that's the main goal, right? Best of luck however you are guided. Curt