Homalocephale is a bit bigger, and more bulky. Gasparinisaura doesn't seem to have any good weaponry.

Yeah my vote doesn’t count

Homaleocephale

1.8 Meters Long

0.7 Meters Tall

30 Kilograms

Gasparniasaura

1.7 Meters Long

0.75 Meters Tall

15 Kilograms