I need advice (making right choice)

Hello guys, I need someone with experience to help me with niche. Let's say I want to do something about cars. Is it better to create a website with topics like Car reviews, maintenance, car parts, fixing car ... etc. or is it better to go just with particular stuff like website about car tyres.
So long story short... what is better (for making money) website with general niche or website with precise things (sub-niche)?
Thanks

Creating a blog about cars in general will bring you visitors interested in cars but from different angles (car brands, car repairing, car dealing, etc.). You will have it harder to monetize because it can happen that people that are looking at car brands are not interested in car parts...but this doesn't mean its not the right choice. It depends on the niche really. For example, if you write about how to fix things on cars and how to get cheap parts...you will attract people that are categorized under one common topic, therefore monetizing can be easier and more efficient.