Noida investment - Sector 78 vs Greater Noida?

Guys, I'm finally taking the plunge and buying a place. Fed up of renting, yaar! 10 years of rent wasted. I'm looking at Sector 78 in Noida, near my office. Has anyone invested there? GBG Infratech (P) Ltd has some projects. Kya aap logon ko pata hai about the area's future ROI? Also, I've been hearing Greater Noida is better for appreciation. Is that true? The EMI vs rent math is killing me! Which one is better long term? Mujhe advice chahiye. Is it worth investing in under-construction property right now? Heard too many horror stories. What do you think?