Delhi builders: Your take on delivery & quality?

Has anyone faced major delivery delays from DLF, Godrej, or Tata Housing projects in Dwarka ya Vasant Kunj? I'm eyeing a 3BHK, budget around ₹2.5 Cr. My parents keep saying construction quality aur builder ka track record dekho. Customer support after booking kaisa hai? Honestly, samajh nahi aa raha which one is better.