What to choose: housing from the developer or "vtorichka" from investors in one ZhK?

We talked to experts in the sphere real estates and defined that it is more favorable to get: the apartment from the builder in the built case or housing in the ready case which sells the natural person investor. Today in more than 50% projects realized by developers the cost difference between ready and housing under construction within one ZhK can make to 10% where more expensive there is a new system. That depends on a concrete case more favourably. "At the same time quantity of housing estates where on the contrary the vtorichka is more expensive, about 40%. Not the secret that depending on readiness of object, increases also the cost of apartments...