I would say ABH but it is not just the degree of injury caused, it is the intent of the offender that matters.
Examples of GBH:
Injury resulting in some permanent disability or visible disfigurement
broken or displaced limbs or bones
injuries requiring blood transfusion or lengthy treatment
Examples of ABH:
loss or breaking of teeth
temporary loss of sensory functions
extensive or multiple bruising
minor fractures and cuts requiring stitches
psychiatric injury going beyond fear, distress or panic