Ready possession is overrated, under-construction Noida projects are better ROI?

Finally taking the plunge and buying in Noida. Fed up of renting, landlord ne phir rent badha diya. I'm looking at Ansal Carnation Garden (Greater Noida) and Assotech VSNL Officers Apartment (Noida). Assotech is ready to move, but almost double the price. Is the carpet area in Assotech actually worth it? Or should I gamble on under-construction and maybe get better appreciation? Kya kisi ko Ansal ka track record pata hai? Which one would you choose for investment, considering resale?