Niche or variety of topics?

Hi, I'm looking to create an affiliate website and I've seen many different types that seem to have success. My question: is it better to have a niche website that has a domain on that niche (such as lawnmowercentraldotcom) and only content related to the niche (how to, best of, etc) or is it better to create a general domain/site (productreviewsdotcom) and write about a wide variety of topics or niches where u see opportunity? pros and cons of each strategy? thanks

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