Confused about pre-launch deals and payment plans

Sectors 82-84 – been looking here for a 3BHK for my family. My wife's priority is a good school nearby and safety for the kids. Paramount Associates had some pre-launch offers, but honestly, is early-bird pricing actually a discount in Gurgaon? Or just marketing? Also, I'm really confused about payment plans. Is construction-linked smarter than a down payment plan for a project like this? Worried about delays with construction-linked. What's been your experience with these options?