Noida Extension ya Sector 3: Investment ke liye kaunsa better?

Guys, I'm thinking of investing in Noida real estate. Sector 3 vs Noida Extension – which one offers better ROI in the long run? Kya aap logon ko pata hai about the appreciation rate? Also, what do you think about Skytech Group projects? Has anyone experienced delays with them? Mujhe advice chahiye on whether under-construction is worth the risk or should I go for ready-to-move? What's your take on rental yield in these areas? Any suggestions?