Glaive
A glaive has reach. You can strike opponents 10 feet away with it, but you can’t use it against an adjacent foe.
Guisarme
A guisarme has reach. You can strike opponents 10 feet away with it, but you can’t use it against an adjacent foe.
You can also use it to make trip attacks. If you are tripped during your own trip attempt, you can drop the guisarme to avoid being tripped.
Halberd
If you use a ready action to set a halberd against a charge, you deal double damage on a successful hit against a charging character.
You can use a halberd to make trip attacks. If you are tripped during your own trip attempt, you can drop the halberd to avoid being tripped.