Should I go for construction-linked payment in Mohali?

Visited a few Emaar projects in Mohali last weekend. Saw 3BHKs around ₹1.5 Cr. Builder is pushing construction-linked payment plans, but I'm unsure if that's smarter than a bigger down payment. Also, should I deal direct or via a broker for better pricing? Honestly, I'm worried about hidden costs and getting the best deal.