From 2BHK to 3BHK — my payment plan dilemma

Golf Course Extension Road — been checking out projects there for a 3BHK. Currently in a 2BHK in Sector 57, thinking of upgrading. Already have a home loan. Builders are pushing construction-linked payment plans (CLP), but I'm wondering about down payment schemes. Is CLP always better, ya phir down payment mein koi hidden advantage hai? For a 1.8 Cr property, EMI planning kaise karein with these options? Kya lagta hai, which one makes more sense for a second home buyer?