I have a client with
- a Wordpress blog running on blog.example.com with over a decade of posts at least once a week. Lots of content.
- a brochure site powered by Drupal running on
www.example.com with just a handful of pages.
He wants to update the look and feel of the site. I've felt for a long time that he went down the wrong road by running two platforms - it makes his site more expensive and cumbersome to maintain. And in any case, he's on Drupal 7, which he will have to get rid of at EOL anyway, and there is no simple upgrade path from Drupal 7 to Drupal 9.
So the obvious part is that both the blog.example.com and
www.example.com should be on Wordpress. No need for two platforms and he has so much on Wordpress already that's the obvious choice (and his writers are used to it, etc etc).
The less obvious part... Technically, it shouldn't be hard to rewrite (not redirect) the URLs so it is one WP install, but it still looks like the blog is on a blog.example.com and the brochure is on
www.example.com, but I'm thinking more about they question of whether or not to actually redirect the blog URLs to
www.example.com/blogThoughts? Are you a fan of blogs on separate subdomains or not? Regardless of how you feel if starting from scratch, what do you recommend to someone with a long-established practice of having two separate hostnames?
FWIW, Mueller says...
Google may take a little longer to figure out that you’re using subdomains instead of subfolders, but in the long-term, it makes no difference which one you pick.
In this case, though, Google has already figured it out.
