Always thought a boar spear had a larger crossbar to prevent the boar from running up the spear...will have to consider getting me one of these just the same...
I guess a larger crossbar would get tangled in thickets.
Cold Steel has come out with a European Boar Spear with the larger, wider head and a bigger crossbar (quillion).
https://www.amazon.com/4000346-Cold-Steel-European-Spear/dp/B00HZIK36G