What are the best bitcoin mining rigs and hardware?

In the realm of cryptocurrency mining, the quest for the optimal bitcoin mining rigs and hardware is a never-ending pursuit. Could you elaborate on the current market leaders in terms of hashing power, efficiency, and cost-effectiveness? Are there any specific models or brands that stand out in terms of their reliability and longevity? Furthermore, with the constant evolution of mining technology, how do miners stay updated on the latest advancements and ensure they're investing in the most profitable hardware? Lastly, what are some of the key factors to consider when evaluating different mining rigs and hardware, such as power consumption, cooling requirements, and ease of setup?