Id really have liked to see another look into the 06's universe. Routh did a fine job with the material provided. Ida liked to see him take on a more advanced Superman role.
At the time I would have loved to see a sequel, I can't say that I would prefer one over the other, I haven't seen the new one yet. I loved Returns and really wanted to see Singer do a sequel. The thing is, Singer said from the get go that the first movie was going to be slower and more romantic and the second one would be more action packed, it's just nobody payed attention to that. WB new this, but for whatever reason ditched the project anyway. I'm currently happy with what I've heard about the new one so far, so it's all good IMO.