My Mathwing is weak but it seems like ATC + 2 dice with nothing to modify the roll
But Howlrunner allows for the roll to be modified, and since with ATC you keep the target lock from turn to turn you can presumable focus (or marksmanship), so it is ATC + 2 dice focused and TLed. With the added benefit that the advanceds are dangerous enough on their own that Howlrunner might not be the #1 target.
But if she was still the primary target, Alozen with Draw Their Fire would be a pretty good buddy. I think overall the ATC Advanced with Howl aren't going to be as big a deal as the TIE swarm, because they have to TL first, and they don't have the 1-turn to knife fight. First turn in combat, you won't have the TL, so it will be a less damaging, tougher TIE swarm. You will very, very rarely have 2-3 Advanced with TL and in formation with Howlrunner.