WHM: Controller or Mouse/Keyboard?

[Sebazy]

TLDR: Use whatever you are most comfortable with, mouse and keyboard's advantages are nothing like as significant as something like motion controls in Splatoon 2 or mouse and keys in an FPS.

Personally, I couldn't stomach raiding savage etc on a gamepad though. Mouse and keys is rather akin to a somewhat significant ping advantage, I can target party members nigh instantly, turn my camera faster, start moving quicker, stutter step/cast crisper and perhaps most significantly, I'm able to comfortably use all my hotkeys as normal whilst still having complete control over both my motion and camera at the same time.

https://youtu.be/BLGUMzl2cV0?t=7m31s

Is a fairly decent example of this in action. The jumps whilst casting instants allows me to keep moving in a direction whilst using abilities that would otherwise turn me around whilst the ability to manually control where I'm facing via right click whilst moving independently is proving it's weight in gold this tier, what with all of the face away to dodge mechanics we're getting this time round.

It's not going to make or break anyone's level of play, but it is an undeniable advantage once you get it down.

[Extreme]

TLDR: I'm able to comfortably use all my hotkeys as normal whilst still having complete control over both my motion and camera at the same time.

you know you can set the camera to legacy so you won't have to turn your camera every time a aoe is beginning to land.
EDIT: not to mention bring up the camera sensitivity pretty high

[Sebazy]

you know you can set the camera to legacy so you won't have to turn your camera every time a aoe is beginning to land.
EDIT: not to mention bring up the camera sensitivity pretty high

Backpedaling with legacy controls spins your character around even if you hold right click. This is a pretty big deal for certain encounters ranging from the likes of T7, Thordan and of course O2S+O3S. I spent years getting into the habit of strafing sideways to 'reverse' in WoW PvP which gives me options depending on if I need to get clear of an aoe or need to face away but still be able to start moving into position early (Without the risk of accidentally spinning to face the mechanic that legacy adds).

[Lyrai_Celestine]

you know you can set the camera to legacy so you won't have to turn your camera every time a aoe is beginning to land.
EDIT: not to mention bring up the camera sensitivity pretty high

I wonder how many people use the Normal camera and the people who use the Legacy camera, and if there is a certain advantage / disadvantage to it.

For myself, I use the Legacy controls. In the normal camera, when I press back, I just hate the fact that I walked backwards slowly while still looking on the same direction. In Legacy, I can just turn around with a press of a button and run in that direction instead, showing my back to the enemy (and easily avoid eye contact mechanics with impunity). I can refer to this type of movement to the more Action oriented games like Monster Hunter, in which manueverability is the forte.