Personally, I don't like:
Water Trident {elite} -- The non-elite Ice Spear owns this, in my opinion. It does the exact same damage, is very spammable (0 recharge time). Sure, the range on Water Trident is normal spell range, but it's got a 3 second recharge time. What really kills this skill is that it's supposed to "knock a moving target down". First problem: the target must be moving, so it's too conditional to fit this in any builds that works specifically on knockdowns. Second problem, and this is the killer --- the flight speed on this projectile is so slow it rarely even hits a moving target (problem is compounded by fact that many good PvP players do some tight strafing when retreating). I think if you seriously wanted to annoy the hell out of a Flag Runner or something, just bring Ice Prison.
Water Trident is an awesome skill if used correctly. My basic combo is: Ice Prison for the slowdown, Maelstrom immediatly follows, then Trident AS SOON AS you see the enemy move. If you time it right, you will knock down your opponent who is trying to get out of the radius of maelstrom. By the time he gets up, you can Trident him again, or ice spear him to death. Remember, during this entire time, your target wont be able to cast.
You have to be really good on your timing for this however. If you miss your timing for the first Trident, then they will be out of range of your Maelstrom.
Also, the Ice Prison/Water Trident combo works amazingly on Warriors. Got a warrior charging after you? Throw Prison on him, then trident, then spear. Back up a little, Trident + Spear. Just rinse and repeat. = dead warrior.
Water Trident {elite} -- The non-elite Ice Spear owns this, in my opinion. It does the exact same damage, is very spammable (0 recharge time). Sure, the range on Water Trident is normal spell range, but it's got a 3 second recharge time. What really kills this skill is that it's supposed to "knock a moving target down". First problem: the target must be moving, so it's too conditional to fit this in any builds that works specifically on knockdowns. Second problem, and this is the killer --- the flight speed on this projectile is so slow it rarely even hits a moving target (problem is compounded by fact that many good PvP players do some tight strafing when retreating). I think if you seriously wanted to annoy the hell out of a Flag Runner or something, just bring Ice Prison.

Water Trident is an awesome skill if used correctly. My basic combo is: Ice Prison for the slowdown, Maelstrom immediatly follows, then Trident AS SOON AS you see the enemy move. If you time it right, you will knock down your opponent who is trying to get out of the radius of maelstrom. By the time he gets up, you can Trident him again, or ice spear him to death. Remember, during this entire time, your target wont be able to cast.
You have to be really good on your timing for this however. If you miss your timing for the first Trident, then they will be out of range of your Maelstrom.
Also, the Ice Prison/Water Trident combo works amazingly on Warriors. Got a warrior charging after you? Throw Prison on him, then trident, then spear. Back up a little, Trident + Spear. Just rinse and repeat. = dead warrior.


Yup Trident is an awesome skill, and annoys warriors like hell 
Easier to use for more builds.