My Greater Noida pre-launch dilemma

Honestly, I'm finding pre-launch deals in Greater Noida confusing. CBPL Homes Sector 120 mein pre-launch pricing attractive lag rahi hai. But is early-bird discount actual mein better, ya baad mein spot deals milte hain? Already 2BHK mein hoon, 3BHK upgrade ka soch raha. Investor perspective se, pre-launch sahi hai kya?