Greater Noida: Which builder has best quality and maintenance for families?

Okay I'll be honest — I completely underestimated how confusing this process is. We need a 3BHK in Greater Noida, thinking Noida Extension or Pari Chowk for the kids' school. I'm looking at Gaurs, ATS, and Gulshan Homz projects. My biggest worry hai construction quality and post-possession society maintenance. Kitna achha rehta hai after 2-3 years? Aur on-time delivery ka track record kaisa hai inka? Any recent experiences ya reccos for families? What does the community think?