Sector 152 flat vs plot, some hidden costs I found

Finally taking the plunge and buying in Noida. Sector 152 mein flat dekh raha tha, but plots are tempting too. N S Group ke projects kaise hai? Under-construction mein risk hai, I know. Plots mein bhi toh boundary, construction ka kharcha hai. EMI vs rent ka calculation actually work karta hai kya? Any advice?