What builders don't tell you about Ghaziabad projects

Budget finalised, loan pre-approved – now stuck on which builder to trust in Ghaziabad. I work in real estate, so I know the super area vs. carpet area games, but buying for myself feels different. I'm looking at Gaurs, ATS, and Mahagun for a 3BHK in Crossings Republik or Raj Nagar Extension, around ₹90L. What's the real story on their delivery timelines and construction quality, off the record? Any nasty surprises with hidden charges at possession, like PLCs or maintenance deposits, that aren't clear upfront? Need honest opinions.