The absolute best high current 21700 on the market: Molicel P45B
This cell was developed for supercar makers to have sky high capacity while also having super low internal resistance. That means the cell can run very high currents while staying cool. To top it off, it has amazing cold temperature performance as well with over 3.51Ah at -30 C. This is by far the best high power 21700 available as of 2023. Nothing can touch this performance.