NON Archer kit Bow advice

So my current fighter/mage will be going into BG2 soon and I was curious what bow proficiency I should focus on. If I were an Archer kit, I would use short bow as the Archer kit's strength's lie in the most attacks per round possible. However, since my fighter/mage is not an "Archer" per se, would long bow be a better choice? Or would short bow still be stronger?

As a side note, I know melee is generally a stronger choice for a fighter/mage but this build is themed towards archery. A sort of Arcane Archer, if you will.