Did you maybe say that you were reluctant to inject? I know of some people who are put on a regime with fewer injections because of that. Personally I'd rather inject more and get the flexibility. But I know everyone's different.
As far as I know, the benefits of twice a day are purely that it's convenient to do, and it can be fine for many people, especially if they have a quite standard day/lifestyle that doesn't change a lot day to day.
The downside is that you can end up eating to match your insulin rather than injecting to what you want to eat. The long lag times while you wait for your insulin to work make it a little harder to find out what insulin dose you should have for the carbs you are eating.
Do you adjust your own doses to the carbs you are currently eating? What kind of info did they give you when they put you on insulin? (not much by the sound of it?)
If I were you I'd ask them what the best insulins would be for your lifestyle, and describe your lifestyle to them. If they don't really know what to advise, or why they have decided on one insulin over another, ask to speak to a specialist.