Noida Extension vs Sector 2 - Which is better?

Hey guys, I'm looking to upgrade to a 3BHK in Noida. My kids' school is in Sector 2, but Noida Extension seems way more affordable. Has anyone here actually lived in both areas? My wife wants a safe society for the kids to play. Sector 2 is older, but Extension is still developing. Also, kya aap logon ko pata hai about Arihant Group? Are their projects good quality? Mujhe advice chahiye. Is it worth paying extra for Sector 2's established infrastructure, or is Noida Extension sahi hai for a family? What do you think? I'm so confused! Any thoughts?