Using the Long Axe is a complete no brainer if you only have pole wpf. A 2h weapon with 0 wpf is never going to be better than a polearm with whatever wpf you have. 15% damage per 100 wpf, 6,5% swing speed increase per a 100 wpf. You only do a 100% damage at a 100 effective wpf. Let's say you have a 100 effective wpf in polearm:
Long Axe = 41c x 1,00 = 41c effective damage
Two Handed War Axe = 43c x 0,85 = 36,55c effective damage
Long Axe with it's beastly 41c at 97 speed is probably the best weapon in the game when it comes to fighting and destroying shields. That shit is fast. It is 4k more money, but I'd rather fight a shielder with a War Spear (that you probably have +3) than an unloomed 2h axe without wpf.