Noida reality: rental yield math doesn't always check out?

Nithari (Village) keeps popping up as 'affordable' but I'm skeptical. Seeing 2BHK flats advertised with crazy rental yields, like 6-7%. Honestly not sure if those numbers are real after maintenance, property tax, and all that. My parents keep saying 'buy ready-to-move, less headache'. But under-construction seems cheaper, right? 3C Company has some projects, but possession dates are always a worry. Ab samajh nahi aa raha. Is it worth the risk for potentially higher ROI, or stick to ready-to-move even if the yield is lower? What's everyone's experience with actual rental income vs advertised? Which would you pick? Vote below!