Which class has the easier resource construct depends upon how you play, but resource pools are large enough that TP costs only matter in extreme circumstances (the only common one of which is brought up later). The rotation that they use (using the one from my previous post) costs 650 ((70+60+60) * 3 + 80) over 10 GCDs, or 65 TP/GCD. The WAR rotation is slightly more expensive at 860 ((70 + 60 + 60) * 2 + (70+60+70) * 2 + 80)) over 13 GCDs, or 66.15 TP/GCD. Base resource gain is 60 TP every 3 seconds or 50 TP/GCD. As such, the net loss of a PLD is 15 TP/GCD (~63.33 GCDs before you reach 50 TP and are forced to have an open GCD) whereas a WAR has 16.15 TP/GCD (58.82 GCDs until empty GCD). The difference isn't major, but it's present. Of course, if you factor in Berserk, where a PLD loses 2 GCDs every 36, cost goes down to 62.48 TP/GCD and the net loss becomes 12.48 (76.12 GCDs before out). Honestly, most fights have some degree of downtime so that you're not attacking constantly. It doesn't really take all that much to allow a tank to have infinite resources for all intents and purposes.
When you bring in AoE threat, the difference becomes rather starl. Overpower costs 130 TP/GCD, which is a net loss of *80* TP/GCD whereas Flash is effectively free but limited to 7 chain casts before you run out (every 22 seconds you get MP equal to an additional Flash; 2% per 3 seconds; 1474 max mp with Flash at a cost of 212). Flash is also a net gain of 50 TP every time you use it. If you string Flash into your rotation, you can have a PLD that, quite literally, never runs out of resources. Each use of Overpower, on the other hand, is, effectively, 6.4 GCDs of TP consumption right off the bat. Overpower is expensive as *hell*.
It's for this reason, the difference between Flash and Overpower's relative costs, that it's really hard to properly gauge the AoE effectiveness of either class. WAR gets better burst AoE threat, but it comes at a steep cost. PLD has better *consistent* AoE threat, which also has a larger area and is easier to use because it's a PbAoE rather than a targeted cone, that is, effectively, free. If there is a long period of time between add packs, WAR gets to shine. If there *isn't* or the packs is more spread out, PLD wins by a mile.