Noida property: Resale market secrets for investors?

Secondary market deals in Noida are where the real value is, not builder projects. Fed up of paying rent, my EMI vs rent math is finally pushing me to buy. I'm looking at Sector 63, even some Aadvi Group properties. Builders ka 'no negotiation' policy kitna true hai? Kya secondary market mein zyada scope milta hai for a good deal? Like koi distressed seller pakad ke... ya new projects mein hi better spot discounts mil jaate hain? Not sure if that floor-rise premium makes sense for an investor. Any tips on spotting underpriced assets?