Noida Extension: Where's the *real* 5-year ROI?

My loan's pre-approved for Noida Extension, but I'm stuck between UCHDL Elegantia and Capital Green Avenue 74. Elegantia's under-construction status means higher risk, but maybe better appreciation? Capital Green is ready, lower entry point, but what about total cost of ownership, including maintenance? From my experience, completed projects can still surprise you. Which one offers better 5-year ROI, considering all charges?