My 2BHK upgrade path: Noida Ext. amenities reality

Honestly, after living in my 2BHK for years, I thought upgrading would be simpler. Deepak Green Residency mein 3BHK dekh raha hoon. Investor point of view se, power backup aur elevator quality kitni matter karti hai? Full flat backup milta hai ya sirf common areas? Resale value pe impact aata hai kya agar backup issues hon? Ya phir tenants adjust kar lete hain, kya kehte ho?