As it says in the title. I'm kind of curious. (EDIT: I should also preface this that I don't consider "easiest" to be negative, as many people ask the question when trying to find a recommendation for picking a role up for the first time.)
For filler, PLD has a 1-2-3-4-4-4 where a -5 can be used anywhere between a given 3 and the next 3 (anytime from right after Royal Authority, through the Atonements, Fast Blade, all the way to after the following Riot Blade). WAR, by contrast, has a 1-2-3 that repeats, with a -4 that has a "flexible" 30 sec timer (e.g. you can refresh it anywhere from 30 to ~1 sec remaining on the prior one), and a gauge with a "don't overcap" -5 in Fell Cleave, as well as not overcapping on Infuriate.
PLD has two 30 sec oGCDs and a 2 charge gap closer, WAR has one 30 sec oGCD (an AOE and single-target version but they share a CD) and 3 charges of gap closer; both gap closers regenerate one charge per 30 sec.
In terms of burst, both are on a rigid 1 min timer, with PLD's opening with Fight or Flight and Requiescat, and containing an independent GCD (Goring Blade) and 4 presses of your Confetior button, as well as attempting to fit in both 30 sec oGCDs and both charges of gap closer, and a Holy Might empowered Holy Spirit. WAR's opens with Inner Release and has one independent GCD (Primal Rend), and 5x total Fell Cleaves between the 3 free from IR and 2 more from a full gauge...and two more from Infuriate, as well as fitting in its attack oGCD Upheaval, the Infuriates, and gap closer...but with the caveat that it ideally wants 3 of those for the 2 min burst, so odd minutes will only use 1 so the WAR can save three before the 2 min burst.
In terms of damage rotation, these seem...comparable...to me. WAR's has a little more thinking in terms of 1 min vs 2 min burst that PLD's does not, as well as gauge management, but PLD's base filler rotation has slightly more going on, though without having to track an upkeep buff of any kind. Their bursts also seem roughly comparable, with WAR's again involving a bit more in terms of gauge and CD management vs PLD's involving more different buttons.
Their defensive kits are largely comparable in terms of what they have, with PLD's being EVER so slightly more cumbersome (Passage having to be aimed, Shelltron/Intervene having a gauge cost), but still pretty straightforward.
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WAR has long been considered the easiest Tank, but I'm curious if that still seems true?
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EDIT2: I suppose standard "it's ultimately subjective" applies. More just wondering various people's thoughts on it. Personally, I find PLD easier now, but I'm sure not everyone does.