Jax is so much of a threat that he's better with an EPT that will help his survivability. PtL is much better to allow him a focus+evade combo for defense.
As other have stated, I would still take a focus token to prevent the use of Opportunist against my ship ver a TL to help me in attack. Plus, if you get Jax in range one of any ship with an evade or focus token, you guarantee yourself that you won't use Opportunist with ANY ship for the whole round. Better to let him take the action and allow him to use it before you shoot. If he doesn't, you'll save yourself a hit or make 1 more; if he does, you get one more dice with your Opportunist ship. Win-Win.