What is the best Bitcoin miner?

As a keen observer of the cryptocurrency market, I'm curious to know - given the constant evolution of mining technology and the rise of new players in the field - what is currently considered the best Bitcoin miner? Is it a matter of hashing power, energy efficiency, or perhaps a combination of both? What specific features or characteristics should one look for in a miner to ensure maximum profitability in today's Bitcoin mining landscape? With so many options available, it's essential to make an informed decision, and I'm keen to hear your expert opinion on this matter.