Subdomain - same thing as exact match domain?

How important is exact match domain in your opinion?

How would you rank these 3 domains for a keyword "car stereo", if they all had exactly the same quantity and quality of links and other ranking factors.

CarStereo.com
Car.Stereo.com
Bullshit.com/Car-Stereo

CarStereo.com would probably rank the highest, but what would be required to make them rank equally? 100 extra good quality backlinks for Car.Stereo.com to reach CarStereo.com ?

How important is exact match domain in your opinion?

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EMD is only one out of over 200 ranking factors. It's not as important as it was, say even 12 months ago. It's useful for ranking longer tail terms in low competition niches. IMHO age, trust and authority are more important, especially in competitive niches.

How would you rank these 3 domains for a keyword "car stereo", if they all had exactly the same quantity and quality of links and other ranking factors.

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If the plan was to dominate the top 3 spots for that search term, whether you get 1 (or more) new EMD's would depend on the competition and value for that term. If it had value, I may consider other web properties or even buying aged domains.

it is recommended to use everything under the top domain, the subdomain idea is not that great, so I would rather use CarStereo.com/some-link

what about carstereo.carstereo.com/carstereo

I wonder whats gonna happen to have keywords all over (serious question tho)