Poleaxes are pretty good at everything, although the price kinda makes up for it. Thrusts, swings, speed, power, shieldbreaking, knockdown. Here's some of my favorite specialized polearms:
Long Bardiche - Unlike the long great bardiche, it is not unabalanced. That's a huge bonus. 140 reach and 45 shieldbreaking cut damage swings make it better than any actual axe in the polearm tree of items. I really like the model too.
Long Maul: Longest crushthrough weapon in the game. Overheads feel like something between a halberd/bill and a maul. It's wonderful to use only overheads (not spamming, but saving the swing for when it counts) with a good ally to fight alongside. The weight will give you plenty of knockdowns if you go for side swings.
Long Hafted Blade: A faster glaive. Unique model that looks great with eastern armors. It's like a reverse warspear: stronger swings, weaker thrust.