Is 2BHK or 3BHK better for Gurugram investment?

Is a 2BHK or 3BHK better for investment returns in Gurugram right now? I'm looking at places on SPR or maybe Dwarka Expressway, around 1.5 Cr budget. I know what builders don't tell you, but for my own buy, I'm honestly torn. What's the real rental yield difference, especially with the upcoming SPR Metro?