Evaluating my next Chandigarh investment strategy

After several investment cycles here, I'm evaluating a 3BHK in Aerocity, quoted around ₹1.8 Cr. I'm weighing a construction-linked payment plan versus a higher initial down payment. From an ROI perspective, which strategy generally yields better total acquisition cost for properties in sectors like Aerocity or New Chandigarh? I'm also keen on understanding typical hidden charges that surface closer to possession, beyond stamp duty and PLC. What does the community think is the smarter play for maximizing value?