According to your requirements, we can compare Caltex 9 16 with 339. First of all, 9 16 has higher output power and can provide faster cutting speed, while 339 has lower loss and longer service life. In addition, CODEX 9 16 has higher efficiency and can provide lower running cost, while 339 has lower noise and vibration, which can better protect your equipment. In short, you should choose the file that suits you according to your actual needs.