Selected answers from the Dumb SEO Questions Facebook & G+ community.
Sakib Shadman: Both needs SEO but why not start w content? If it`s big enough you can go for moentization.
Ammon Johns: What are you either extremely knowledgeable, or extremely passionate about? I mean, if it turns out you have a deep and abiding passion for lawnmowers then by all means open an affiliate site selling lawnmowers. But to practice the entire point is to build a site, and test lots of stuff, which means it needs to be on a topic you can talk about all day, and write as much content as you need about.
Dominik Mikula: Listen to this man. He’s got a clue. I remember when I tried to write about Nootropics. The concept of it fascinates me. The idea of talking them is so intriguing.
Writing content about the niche. Man, I’d rather chew glass and wash it down with a lava slushy
Adam J. Humphreys: What Ammon Johns says. Write about what you know and make it better than a combination of all the top search results for the query you`re trying to rank for.