Construction-linked plans are confusing for first-time investors

I'm looking at a 3BHK in Sunpura with Lotus Parkscape, around ₹90L, near the Yamuna Expressway for future Jewar airport gains. They're pushing a CLP but also hinting at a decent spot discount if I pay more upfront. Honestly, I'm not sure which way to go to maximise my ROI. My parents keep saying to go for CLP for safety, but then I lose out on the potential discount. Is it smarter to take a 5-7% spot discount and manage higher initial outflow, or stick to CLP for lower risk and slower payments? Also, how much can you realistically negotiate on these so-called spot discounts in Noida? Are they real or just a marketing gimmick? What's the best strategy for total acquisition cost here?