Ready to move vs Under construction: Worth the gamble?

Anyone compared Jaypee Augusta Town Home to Paramount Floraville? Augusta is ready to move, right? But Paramount Floraville is completed too. Is it worth paying extra for ready possession? I'm honestly not sure. Heard stories about possession delays, but Floraville looks good. Also, what about carpet area efficiency? Which one gives you more usable space for the price? And builder trust, has Jaypee delivered on promises, or are there hidden costs? Should I risk under-construction for potentially higher ROI, or stick with the safety of ready possession? Any first-hand experiences would be great! Not sure if the amenities are actually usable. Thanks!