What i dont like about the ice staff is the fact that zombies still attack you after you shoot them, which can get you into real shit. Great ammo though.
The Wind staff is very powerful and fun to use, but really lacks on ammo.
The fire staff is a great overall staff, good against panzers, good ammo, pretty much good everything.
The lightning staff is also powerful against panzers and has great ammo. What is great about it is that you feel secure when using it, because if you ever get stuck surrounded by zombies, just shoot at your feet a couple times and your safe.
Considering all these reasons here is my top 4:
Lightning
Fire
Ice
Wind