Verified differences

FieldMiniMini S
GNSS25 Hz25 Hz
Motion1 kHz internal, 25 Hz outputSame
Internal storageNo130 min at 25 Hz; 325 min at 10 Hz
Phone dependencyContinuous connectionCan record standalone
BatteryOver 20 hours activeOver 20 hours active

Decision

Choose Mini S when losing the phone connection must not lose the session. Choose Mini only when the connected app will always remain active and the lower cost matters. Neither provides direct OBD-II.

Sources