And under-hand would give way to sime nasty wounds on your team mates thanks to the butt of the spear. It'd make your formation wider and more spaced thus taking out charge effect and Hoplite warfare based a lot on the initial charge. so, a wider formation means less momentum built and that would leave you at a disadvantage. One on one, under hand might be better but in army Vs army I think over hand is the logical choice.


Cheers...