From a carb content standpoint, the vinegar and olive oil dressing is clearly the better choice. But that is not all there is to be considered - taste counts. You need to find something that you at least don't mind consuming and, if possible, enjoy consuming. Otherwise it will always be a battle to continue.

DANDR's guideline on dressing is that it should have fewer than 2g of carbs per serving. So don't even consider one that has more while on Induction. If you are off Induction, then you can raise that limit appropriately. Remember that the goal is to spend the vast majority of your carb allowance on good vegetables.