Why xml sitemap is best?

If your using Wordpress any of the XML Sitemap plugins will do, they're all virtually the same.

 

Xml sitemap could also be dynamic genarate with a component, so you haven't to upgrade it manually reverytime you add content to your site!

 

Well, xml sitemap gives you a seo benefit, and thus helps the site to gain good rankings in serps

 

i also think that your site should have xml sitemap and txt sitemap.

 

Benefits to using a xml sitemap

The first set of benefits revolve around being able to pass extra information to the search engines.
Your sitemap can list all URLs from your site. This could include pages that aren't otherwise discoverable by the search engines.
Giving the search engines priority information. There is an optional tag in the sitemap for the priority of the page. This is an indication of how important a given page is relevant to all the others on your site. This allows the search engines to order the crawling of their website based on priority information.
Passing temporal information. Two other optional tags (lastmod and changefreq) pass more information to the search engines that should help them crawl your site in a more optimal way. "lastmod" tells them when a page last changed, and changefreq indicates how often the page is likely to change.

 

Xml site map used for url crawling of a website .