I'm a big fan of VI on Turr. His ability is the most potent when he shoots before his opponent. If you fly him well, he doesn't even get shot at
VI on Turr only matters when you're up against level 9 pilots when you've won Initiative, level 8 pilots, and level 7 pilots when you've lost Initiative.
Of the 20 pilots that fit this criteria, you almost never see Kagi, Steele, Rhymer, Mithel, Vader, Tycho, Ten, Lando, or Horton. That leaves only Luke, Wedge, Han, Jan, Howlrunner, Kath, Boba, and the Interceptor 4 to worry about.
Against Han, Kath, or Boba, you're pretty screwed either way, unless you're that much better of a pilot.
Against Howlrunner and Jan, you're in a good spot either way, unless you're that much better of a pilot.
That leaves Luke, Wedge, and your fellow Interceptors to worry about.
Of course, if any of these ^&(&^*^* are using Swarm Tactics, VI is definitely worth its weight.
I'd rather have PTL, which helps me more universally, than the situational bonus from VI.