Noida's 'ready' projects: What brokers don't tell you

Honestly, even I'm struggling with this. Looking at Jaypee Greens Kosmos B (ready) vs Supertech Supernova Phase IV (completed) in Noida. I know the brochure prices. What's the *actual* builder trust factor for these? And for investors, which has better rental potential or 5-year appreciation? Any real-world experiences?