Here are the results of my recent testing of several China-manufactured 21700 cells and their basic specs. Choose the one that performs the best (highest E-Score) at the current level you will run them at.
Note that two of these cells have bottom vents. I recommend not blocking those vents or pressing hard against them during use.

Note that two of these cells have bottom vents. I recommend not blocking those vents or pressing hard against them during use.