Completed projects in Greater Noida: my dilemma

I'm finally taking the plunge, fed up of renting yaar. Landlord raised rent again, can't keep paying someone else's EMI. Looking at Greater Noida, Rudransh Green Vista and Ansal Sushant Serene Residency towers. Both are completed, which is a big relief, no under-construction gamble. But what’s the *real* total cost of ownership for these? Advertised prices toh alag hote hain, but stamp duty, registration, maintenance, interiors — kitna extra lag jaata hai? Also, for rental potential, which one do you think would be better? Matlab, tenants kisko prefer karenge? Aur in builders ka track record kaisa hai after possession? Any insights on actual maintenance charges and society formation?