Fruit barrel and Vial are going to be very close to each other number-wise. If there are identifiable advantageous times for the on-use of Fruit Basket, then it will be better since it comes out to be more spirit than Vial. However, if that proc can't be utilized then the constant Intellect and on-use of Vial is going to be the better choice.
I'll be switching Fruit Barrel and Vial around depending on each encounter.