Rajkot investors, what's your take on pre-launch deals?

Since last Diwali, I've been tracking projects on Kalawad Road, especially around AIIMS, for a potential investment. I'm targeting a 3BHK, maybe ₹80-90L, focusing on long-term capital appreciation. Builders like Balaji Group and Swaminarayan Group often push pre-launch offers. I'm wondering, is that 'early bird discount' ever really worth it, or do open market prices later offer better negotiation scope? My gut says waiting sometimes pays off. Also, for investors, is construction-linked always smarter than a higher down payment? I'm trying to maximise ROI here, honestly. Should I be wary of floor-rise premiums too? Seems like just a way to inflate prices on those 150 Feet Ring Road properties. What's been your experience with actual savings or hidden catches?