From Dervy -> It's because Ifrit deals both AAs and Normal attacks (Burning Strikes), where as Garuda only casts Windblade. For balancing reasons, SE decided to slash the base INT Scale factor for Ifrit.

It's because Ifrit deals both AAs and Normal attacks (Burning Strikes), where as Garuda only casts Windblade. For balancing reasons, SE decided to slash the base INT Scale factor for Ifrit. Garuda Scales WD better by 0.03 and int by 0.02, per point, which is why Garuda deals more damage per point than Ifrit.