User blog comment:Troll the Fools/Am I right for thinking this?/@comment-5162027-20120716110235

Junglers depend on several things.

1. Ganking potential

2. Buff control

3. Clearing speed

4. Dueling potential

5. Sustain.

Now, your typical tank jungler can do 1, 2 and 4, with a rare 5, in that order of efficiency. Your typical Bruiser jungler generally manages 3, 1/2, 4, and somewhat commonly 5. Now, from the looks of things, it seems like taking a bruiser is better because they tend to be able to do everything, whereas most tank bruisers have a really slow start.

But honestly, it comes down to what you need from your jungler. Tanks tend to have far more epic ganks than bruisers because they tend to have amazing CC effects to totally stop an enemy from escaping. Some Bruisers are good at sticking to enemies or have good CC, but it's extraordinarily rare to have both. Since they bring CC to the gank, it falls to the laner to bring the damage, which usually results in your laners getting the kill, the lion's share of the gold. With a bruiser top, they can use that gold for the expensive bruiser items they need. For AP mid, they can buy their damage, same with AD bot.

On the other hand, Bruiser junglers tend to have a far more powerful time in the jungle. They tend to clear almost exponentially faster, and their ganks are usually a combination of CC and damage- this means that with good coordination, the lane that is being ganked tends to drop faster than if a tank ganks. Bruiser junglers often get kills as they do a lot of damage too, but they can make use of that to purchase their bruiser items, as outlined above. Finally, Bruiser jungles have something that many tanks simply cannot do, and that is counter-jungling.

Control over your jungle is important, but having control over both your jungle and the opponents' jungle is something that is very powerful and valuable. Losing your buffs to the enemy is very hard to come back from, and a strong counter-jungler not only ruins the opponents' jungler, but gets fed through doing so.

It all comes down to what your playstyle is like, what your team values more, and what champions you enjoy playing as. Taking either archetype into the jungle is completely viable, it comes down to what is required. Something else to consider are certain jungler-laner combo's that are considered to be very powerful.

TL;DR They both have great reasons to be there. It depends on what you and your team want.