Ready possession is the ONLY way to go in Noida, fight me!

Kids have moved out, so I'm selling our big house. Looking at smaller flats in Noida, something manageable. I'm seeing Supertech Eco Village which is ready to move. Swaraj Homes Bharat Petroleum Apartment is still under construction, right? Honestly, I'm scared of getting stuck with delayed possession. Heard too many horror stories. Matlab, builder ka track record matters a lot. Plus, resale bhi dekhna hai eventually. Which one would be easier to sell later on, you think? Supertech ka maintenance charges kya hai? That's important for retirees like us. Also, hospital proximity is key. Any thoughts on which project is better for senior citizens? What's the registry process like for these? Anyone have experience? Hope this helps someone.