Noida real estate: Which builder is *actually* reliable?

Okay I'll be honest – I'm selling my big house now that the kids have moved out. Don't need such a big place anymore, want something manageable, maybe a 2BHK. I'm looking at a few options in Noida but confused about builders. Everyone glorifies ATS but nobody talks about the maintenance costs after possession! Sunworld looks good on paper, but I've heard whispers about delays. And Supertech... well, we all know that story, right? Frankly, I'm scared of hidden charges at possession; PLC and all that. Which builder *actually* delivers on time, and whose customer service doesn't disappear after the booking amount is paid? I need elevator, hospital proximity, low maintenance. Change my mind about ATS or Sunworld. Disagree? Tell me why.