They’re both natural lightweight daily moisturizers but Force Field has the added benefit of moderate sun protection (SPF 18). Texture-wise, the balm feels like a lightweight serum or gel whereas Force Field is more of a lotion.
If you have thicker, oilier skin and are going to spend all day indoors, we would steer you towards the Face Balm. If you have normal to dry skin and expect to have some exposure to direct/indirect sun (even on cloudy days), we would recommend Force Field.
As a reminder, Force Field can be used alone as a stand-alone moisturizer, or on top of the Face Balm (or your favorite serum) for extra nourishment and protection.