You don't need PH often, while it's very useful wherever it helps. But you need to AoE often enough. And at least before heroic raids you don't need all the singe target threat of the second spec. So if you only have one spec (and maybe doing 5mans) you may want to have more focus on AoE than on either single target or utility. That may be a reason to get DW and thunderstruck but skip some incite or cruelty for example.
Others use Gag Order a lot in 5mans and want to take that. Again others swear on Safeguard or Impending Victory for different reasons.
If you are just looking for cockie cutter builds, take the second one and be happy with it. If you are looking for the right spec for what you are doing, consider every possible talent and pick the ones that cater the most to your situation.