Confused about builder vs. broker deals for 3BHK upgrade

Okay I'll be honest — I completely underestimated how confusing this process is. Currently in a 2BHK in Sector 57, thinking of upgrading to a 3BHK. Lion Infra Developers LLP in Sector 83 dekh raha hoon. Builders bolte hain 'no discount policy' but brokers kuch 'spot discount' offer kar rahe. Is this real ya bas hype? Who gives better deal, broker ya direct builder?