I have 2 options: a) Write pretty quickly a high quality spintax article with 3 sentence replacements and create 20 articles out of that b) Write 20 unique articles - for that I need 5x more time/money. Is the option b) much better than the option a) in terms of rankings and immunity to future updates? Keep in mind that the I spin 3 sentence replacements with 3 sentence replacements and many synonyms in only 20 copies and that the article is not just readable, but is also a decent read. It is for long term MNS sites. So the site should last at least 12 months.