Several major banks, including Citigroup and Wells Fargo, are set to report earnings, prompting speculation about which bank stocks are the better buy. The banking sector has seen a surge in earnings, lifted by trading and investment banking, with some banks already showing significant gains this year. The upcoming earnings reports are expected to provide further insight into the performance of big banks, with some outlets suggesting that factors like the SpaceX IPO and global volatility may have contributed to booming revenue.