I regret buying the Prima guide, it's trash. So much info is absent, poorly explained, or just wrong.
Prima guides are almost always trash. It's a shame, they we didn't get a new one from Piggyback. Their old one for the Vanilla game is still fantastic.
Confirmed, Prima/ Bradygames guides are trash and live a life of trash. I feel bad belittling the work of those who spent the time writing them, but they often contain massive oversights, like for example in the original XII guide not telling you to avoid certain chests for the Zodiac Spear. And being unable to complete X-2 100% while following their 100% guide.
Piggyback guides for FF are particularly stellar, but they only do main series titles (beginning with VIII) and direct sequels (like X-2, XIII-2 and LR etc.). I can only assume Piggyback cost more for SE so they cheap out when it comes to spin-offs and remasters which is a huge shame.
It's not just the erroneous content that's a problem with the Prima guides though, it's the way they're written. The walkthrough for TZA explains the story in spoilerific detail. Someone using a guide is using it so they know about missables or when to do certain quests or whatever, not so they can read "and then X thing happens to this person" while they're literally watching it happen in game. Why, just why.