It's better to choose a niche with low competition because it will be easier to rank in Google and also, your visitors will likely be more interested in your content.
Although high competition is [not always a bad thing], it can be good because it shows that there's a lot of interest in that particular niche and the possibility for money making is high. However, it may take you a long time to achieve results or to rank on the first page of search engines than if you were to go after lower competitive niches.
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