Minning with GPU is better or Using These devices are better. ?

And also mining of altcoins is profitable or btc ?
and what is the best device to mine bitcoins at good hashrates ?

Salam & Hello,

How are you all? this is my first post here in BCT.
I need some help from experts here who do mining using bitmain antminers i am planning to buy a bitmain antminer to mine bitcoins but can someone please tell me in easy words like how i can set it up and it is really usefull [ AntMiner D3] if not than which is the better machine to use for BTC mining and what is dash mining like i know that D3 can mine all cryptocurrency which use x11 algo can it mine Bitcoins too ?

Sorry in advance for this foolish questions but i am really new in this trying to do invesments on mining projects.