So today in market you can see a lot of mobile phone.
but if you want to buy a unique cell with low budget and very great features.than you can go for redmi 3s prime.that will give you best performance.with 3 gb ram 32 gb internal memory .if we talk about processer than it have Octa-core 1.4 GHz that will give the best performance.android v6.0.1(Marshmallow) in just 9000 you can buy this cell phone.
with 5" screen and with a good camera.
so personally I recommend this cell .