Best Bitcoin miner

Hi steemers

Today ill talk about the best bitcoin miner, thers gpu miner but it cost a huge money 2500 USD to 5000 USD and it expires after 2 to 3 years.
also there is Antminer s9 for bitcoin gives you 12 Th/s but it cost about 2400 USD.
But the Antminer s7 is the best give you 4.5 Th/s cost about 599 USD you can bout three of them to get about 13Th/s that give you same of antminer s9 but cost three of s7 less than s9.
You can get it from bitmain and get 9 months warranty.

This is my favorite antminer s7