301 Redirects

[ Moderator note: moved to Fixing WordPress. ]

I’ve rebranded my blog and need to set up redirects from olddomain.com to newdomain.com/blog. I assume a 301 redirect is the way to do this, but I’m unclear on which version to use:

Redirect 301 / https://www.domain.com/subfolder/

RewriteEngine on
RewriteBase /
RewriteCond %{HTTP_HOST} domain.com [NC]
RewriteRule ^(.*)$ https://www.domain.com/directory/index.html [R=301,NC]

What do you recommend?