New Launch Projects: What could go wrong?

Honestly, I'm a bit nervous about New Launch Projects for our family home. We need a 3BHK; kids' school and safety are my wife's main priorities. Are there hidden risks in this corridor? Builder delays, completion issues... are these common? Ek option Sector 74 mein ready-to-move hai, doosra New Launch Projects mein, say near Sector 150. Price difference bhi hai, but timely possession matters more. What red flags should I look for before committing? Community, help karo!