Covintec is a great product,specially for insulation. They are easy to work with because they are square large panels. Block is cheaper if you have the right crew or someone there to watch over the productivity.
Sometimes it is easier to have a crew use a material they are more familiar with like block. The perfect house would have both,they both have their pro's and cons. If you run air conditioning a lot you should definitely consider covintec. T beams
Concrete t beams with styrofoam inserts are a way to speed up a project and provide insulation for roofs and floors. I would consider all theses products,there are risks with all products. It is best to have a quality control person and a productivity person,this is sometimes considered the contractor,we suggest an independent one that is paid separately from the crew. This could be one person with a strong back bone.
Building per square foot $ is going to depend on how many time you have to do the same project or waste of product.