Payment plans and carpet area confusion for investor

Did some online research on Unnati Fortune Group projects in Sector 16, Greater Noida. I'm based in Dubai, so visiting isn't easy, and I'm really trying to understand the total acquisition cost. Builders often push construction-linked payment plans, but I'm wondering if a down payment plan is smarter for an investor looking for better leverage or a spot discount. Kya sahi rehta hai? Also, the whole Super Area vs Carpet Area calculation is confusing, especially when comparing different projects. Builders ka track record kaisa hai for actual carpet area delivery? Is there a common trap I should look out for that inflates numbers? Worried about hidden charges appearing later. Need some ground reality on this from people who've actually bought there.