Not really, because focus only works once and therefore the majority of defense rolls you make will be without focus (or will have no eyes to use your focus) either way. So in exchange for having one z-95 not have a defensive focus token I get all eight of my z-95s to have a target lock, and all of them get to shoot before your TIEs.
And of course you don't have to use the TL option if you don't want to, it's just silly to claim that the TIEs have a firepower advantage when the z-95s have the extra offense-boosting action available.
Out of curiosity, how do you assign your Target Lock against a swarm? 4 on one, 4 on a second? All on the same? 3-3-2 on different ships?
Because that's my only problem with TL over Focus against a swarm, you don't know which shot will destroy the target, so you can either lose your target lock if the target drop early so no action for you, or be forced to make an unmodified roll with another ship if the target is more resilient than expected. Focus solve this problem, and have the bonus of being use in defense.
Other than that, the possibility of making a TL+Focus shot next turn help the Z for sure.
Edited by Red Castle