No need to get confused, go to loads website and see the products and also you can call them up and ask them their authorized dealers
Also if you live in Karachi, you can visit their factory its in Korangi Industrial Area (I think after brooks Chowrangi) I have seen it myself.
There is a lot of literature on the internet that compares Aluminium and Copper radiators on multiple aspects. You can search scientific studies comparing both types with data and decide for your self.