Help choosing all in one desktop?

I'm thinking of getting a aio, i have selected two. Lenovo b350 which has i7 4770s and a amd 8570a dicrete gpu and dell with i7 3770s and amd r7265 ddr3, i will be doing some gaming like rome 2, cod etc, is r7 265 powerfull than a 8570a i know that r7 265 gddr5 is powerfull but this is gddr3, any suggestion for other models would also be appreciated, and i live in india