Tesla use Panasonic's NCA
Tesla use Panasonic's NCA cells. Other manufacturers, ( e.g Saft and Gaia) also use that same chemistry. Gaia's HP602030, a larger cylindrical, has lower energy density (108Wh/kg) than the Panasonic, but is 45Ah, with a specific power density of 2080W/kg. There is no 'best' cell.
Each is a trade-off. Cost, energy density, power density etc. The 18650 was developed by Sony for use in their early video cameras, then adopted for laptops. By fitting more active electrode area into the same can, Panasonic increased capacity from 2.8A/h to 3.4A/h, via an intermediate 3.1A/h.
Tesla had nothing to do with that.