Assotech VSNL vs Sai Upvan: Investment for family?

I'm weighing Assotech VSNL Officers Apartment against Sai Upvan. Assotech's resale seems decent, but Sai Upvan's price is tempting. Anyone compared the actual carpet area? Kya kisi ko pata hai which offers better rental yield or 5-year appreciation potential for a family? Which has better security features?