Most man pages are written for someone who knows pretty precisely what they want to do, but don't recall which nobs to turn in the program to get that done. The Arch wiki instead focuses on someone who has a vague idea of what tools to use but doesn't know how those tools operate.

I've found that with an intermediate understanding, the Arch wiki is so much better that I often times won't even check the man pages. But on the occasions where I know the thing pretty well, they can be quite spotty, especially when it's a weird or niche tool among Arch users. So, depending on how you define "more detail", that might be an illusion.