Which is better quality vs long-tail keywords

Which is better quality vs long-tail keywords
1) middle quality articles (written by not native speaker), which cover whole topic. Which has title High keyword. Has more then 3000-4000 words. Which obviously easy to share in social networks. But they will not get traffic from google because of poor quality and competitive keyword.
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2) many articles with long-tail keywords. Which are short. Not cover whole topic. Has long-tail keyword in Title. But they will be not readable in social networks. Because they doesn't cover whole topic. Unlikely somebody wants to read such articles in FB, Pinterest, Twitter. But these articles have chance to get traffic from Google, because of low keywords competition.
The article should be at least 2000 words then only it would be good for reading but Long tail keywords get less search traffic, but will usually have a higher conversion value, as they are more specific. Without proper work on keyword, any article goes out of sight so low competitive long-tail keywords are better in my POV.
You have to understand the idea behind the content generation and the purpose it satisfies
I recommend you to read this two posts:
Thanks I will read it soon. I`m not sure that I can rank any serp with articles written by my poor English. Maybe it is better to write for social something which is popular in soical networks. And do not expect to get any traffic from google.
I was thinking that I can write articles to target long-tail keywords and spam it in social networks. It would be great to get social traffic right now and after few months to receive traffic from google. But I think articles which are written for targeting long tail keys will be not popular in social networks. Nobody will share these articles, no likes, no repines. There will be bad time on the site. It is bad for seo.
There's only one way to find out for sure: take action and test it for yourself!

It's tempting to wait for the perfect strategy but you'll learn a lot more by just diving in and writing some content and seeing if you can get it to rank. Good luck :D
Lately, I've been targeting groups of keywords with 4000-5000 word articles with a solid 2-6% keyword ratio inside of the article. I include images, a video (if I feel like making one), 5-10 external links, and 5-10 internal links. I've been getting within the top 8 pages almost every post.
It's tempting to wait for the perfect strategy but you'll learn a lot more by just diving in and writing some content and seeing if you can get it to rank. Good luck

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I know but question is to create content for high popular competitive keyword, which is well shared on twitter, FB. I will have chance to get social traffic for this article. Or create article optimized by long-tail keywords. Which is not been popular in social, but maybe it will have chance to rank google and get search traffic.
Always focus in the quality, bro. I'll always think that quality is better than quantity. If you want to make an article of 2-3k words , good. But make sure those words have high quality content. I wish you all the best.
In the best of worlds, and if you have the dedication and time, why choose?