Which SEO method is better?
I have two seo marketing vendors, the first vendor is saying to work on focused 15-20 keywords and compared to second vendor is saying to work with 60-80 keywords altogether. So can anybody tell which would be the better option?
No, we can't tell...
... without context.
Some companies work with thousands / tens of thousands of keywords and it's perfectly fine. For a small business/individual, even 10 competitive keywords could be too many to start with.
SEO is an increasingly confusing and complicated space, but there are a few rules of thumb that you can follow to make sure your site's on the right track. Leading SEO companies outline two main points that are absolute no-nos:
You should de-focus from primary keywords. Focus on secondary keywords too. This always bring better results for primary keywords. In this way, target 60-80 keywords instead of targeting only 20 primary keywords.