Noida builder on-time delivery is just marketing, right?

Honestly, I'm confused. Everyone hypes on-time delivery, but is it real? Heard mixed reviews about Supertech. Unke projects mein hamesha delay hota hai kya? Any experience with ATS? My parents keep saying Supertech ka naam toh suna tha... ab samajh nahi aa raha. Should I even consider under-construction?