For style it depends on what you like. Gritty/tough animations, go with Gunbreaker. Pearlescent, nacreous animations, go with PLD. Shadowy and sensual, go with DRK.

DRK's lost the most animations over the years, and PLD's never really lost any(I don't count the loss of certain defensives because they basically just Hallowed -1). Of course, DRK has also gained new animations this expansion... and if it still had the Power Slash combo, I'd probably never play anything else.

WAR's animations suffer from basically being a lack of animation. Outside of its combos there's Fell Cleave and Decimate with truly noticeable animations, but Steel/Chaotic Cyclone basically get drowned out by the direct crits appearing on screen. I guess if you like staring at the damage text, then that's a style all its own, but honestly the animations themselves are mildly disappointing. It's lost the second most animations across tanks. Why PLD gets to to keep everything and only get better every expansion is beyond me, but there are other jobs like that as well so... ¯\_(ツ)_/¯

GNB's single target rotation is very sexy and always feels fun at 70+. It's very cool looking. Its AOE rotation on the other hand is dog shit from an aesthetics stand point, since it's literally the same animation twice(one's CW other is CCW, whoopie), followed by that same animation, but now with booms, when you get the Powder Gauge AOE in the 70s. I kinda wish they'd lower the recast on Bowshock, as it's really cool looking, but GNB doesn't need to get any stronger.

PLD's got some of the coolest animations now. I've never liked Royal Authority, it's too prissy for my tastes, but Atonement, Requiescat, Confiteor, Holy Circle, and Goring Blade really get my groove on.