Ask HN: Domain dynamics?

Should the home page of a domain be a portfolio or should it be a blog? I have a really short and sweet domain (reggi.com) and I don't know what to do with it. Should I use subdomains like this? http://portfolio.site.com/ and http://blog.site.com/ . Should I use root folders like this? http://site.com/portfolio/ and http://site.com/blog/ . Examples would be nice!!

Is the best way to do this with multiple wordpress installs or is there a better way?