
Should I open my blog as a subdomain or as a category within the site?

Well the title pretty much sums my question up, I have a friend who sells Fake Grass, and he wants to rank higher in google. I told him to open up a blog about fake grass / gardening ecc... to have content and more keywords.
Thing is should he open up a subdomain like www. subdomain. grasswebsite . com?
Or just a category like www. grasswebsite . com / blog ?
Which one is better for SEO?
That is not his website obviously!

Thank you!!!
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