For SEO purposes, which is be better?

1. A site structure with a silo for X, Y, and Z and each having 5 supporting pages:
domain/x/who; domain/x/what; domain/x/when; domain/x/where; domain/x/why
domain/y/who; domain/y/what; domain/y/when; domain/y/where; domain/y/why
domain/z/who; domain/z/what; domain/z/when; domain/z/where; domain/z/why

While each page has 200 to 250 words, the content is unique and different for each page. The h1 tag would be the who, what, when, where, why relevant for the specific page. Backlinks would be built to the silo main page (X, Y, and Z) as opposed to being built to each supporting page.

OR

2. A site structure with 3 pages of content (plus about, contact, etc.). One page each for X, Y, and Z:
domain/x; domain/y; domain/z

Each page has 5 sections: one section each for who, what, when, where, and why. The word count is between 1,000 and 1,250. The h1 tag would be the applicable x, y, or z and the h2 tags would be the applicable who, what when, where, why. Backlinks would be built to each page (X, Y, and Z).

Bottom line is that the content is the same in both layouts. The only difference is the layout itself. Silo vs Combined. Which is better for SEO?

Thanks!