Supertech Supernova Phase IV

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?

Two years ago I thought Supertech Supernova Phase IV was perfect for us after kids moved out. But now, post-possession, the maintenance charges are insane, way more than they showed. Plus, the advertised club house and pool are barely working. Was told ₹4k, but it's ₹7k! Kya karein, itna paisa waste ho gaya?