Super area vs carpet area: The real difference in your pocket

Did a site visit to Markon Homes in Dommasandra. Quoted price for a 2BHK was around ₹90L, but super area vs carpet area ka difference bahut zyada laga. Kitna usable space actually milta hai? Construction-linked plan mein better deal milti hai ya full down payment pe? What's the community's take on this? Trying to avoid last-minute surprises.