Sector 164 vs Noida Extension — confused about ROI

Been showing properties in Noida for years, but now I'm buying for myself! I'm torn. Sector 164 seems premium, Subhlaxmi Developers are building some nice projects. But Noida Extension mein, you get more for less. Is the potential ROI higher there? I'm seeing decent rental yields advertised. How real are they, honestly? Should I prioritize capital appreciation over rental income? Confused, need some advice!