Question about GCD

[Ditto]

It's because you're a paladin.

Outside of Halone spam, you don't exactly have anything else that would be effected by the gcd that you would use in terms of 'strategic skill usage'. Everything else you have is off GCD, save for your stun, but at the moment I don't believe you'll be using that skill too much end game, save for something like Levi EX (If you even consider that end game anymore). Flash would be the only other thing really, but that just comes down to simple management, and half the time you will have plenty of time to sit through a gcd before you need to flash. That is, if you even need to, because circle of scorn is so much better and is off the gcd.

Those aside, everything else you have comes down to predicting when a large amount of damage is incoming, and using your buffs, which since you're a paladin, are all off of your gcd.

Warrior is the more.. 'strategic' tank at the moment due to having to manage your wrath stacks, and knowing when to inner beast, and getting the best use out of infuriate. Same goes for Unchained, Berserk, and IR, while FoF is more of a 'use it whenever because it's cd isn't very long to begin with' type of thing for Paladins (Outside of burn situations). Then there is also what is considered both tanks biggest 'Oh Crap' buttons, Hollowed Ground, and Holmgang. Hollowed Ground, you just pop and bam you're invincible for 10 seconds. Holmgang has a shorter duration, you still take damage, and you get rooted in place.

So out of the two, most things about the Warrior makes it the more 'strategic' playstyle tank. Hopefully Heavensward will change that with paladins, and I'm seriously hoping Dark Knight isn't a braindead tank job like Paladin is right now.