From broker to buyer: Payment plan dilemma

Budget finalised, loan pre-approved — now stuck on which sector. I work in real estate but buying for myself is different. Dekho, Vamana Group projects near Sector 37 dekh raha hun. Builder ka track record theek hai, par payment plan samajh nahi aa raha. Construction-linked smarter hai ya full down payment? Resale mein negotiation scope zyada milta hai kya, especially for a ₹1.2 Cr flat? Trying to maximise deal value, yaar.