First home search in Greater Noida: feeling overwhelmed

Sector 33A — kafi time se research kar raha hoon Greater Noida mein. Greno Green Realty ke kuch projects dekhe hain, under-construction hain. I'm a first-time buyer, honestly not sure where to even start shortlisting. It's so confusing. Should I go for under-construction for a better price ya ready-to-move for peace of mind? Delivery risk ka bahut darr lagta hai, yaar. How do you guys evaluate a builder's track record for timely delivery? Especially for first-time buyers like me? What was your shortlisting process like? Any red flags to watch out for in under-construction projects?