Noida Investment: Sector 9 vs. Nehra Infra Homes?

I'm considering investing in Noida. What do you think about Sector 9 for long-term appreciation? Has anyone invested with Nehra Infra Homes? What's your experience with their projects? Is it better to buy now or wait for a potential price correction? Mujhe advice chahiye. Which one would you recommend, and why?