I've never found road levers to be easier to use for braking than horizontal cross levers. Unless I'm in the drops, but then I find leaning down that much to be an unsafe stopping position. And if I'm on the hoods, I don't find myself to be able to grip both the hoods and the levers as well as I can on TT levers or cross levers because of the peculiar angle... Maybe I'm just not used to it.

I vote single cross lever. Front brake is all you need! Also when you brake you'll have your hands on the flats which is a much safer position to perform an emergency stop in.