Is it better seo to include locale in getUrl in sitemap.ts or not?

[aboutjquery]

nextjs 14, App route, two locale, en and zh.

<url>
<loc>http://localhost:3000/en</loc>
<xhtml:link rel="alternate" hreflang="en" href="http://localhost:3000/en" />
<xhtml:link rel="alternate" hreflang="zh-Hant" href="http://localhost:3000/zh-Hant" />
</url>
<url>
<loc>http://localhost:3000/en/contact/</loc>
<xhtml:link rel="alternate" hreflang="en" href="http://localhost:3000/en/contact/" />
<xhtml:link rel="alternate" hreflang="zh-Hant" href="http://localhost:3000/zh-Hant/contact/" />
</url>

http://localhost:3000/en now included "en"

is is better to change the getUrl function and made it without locale (en)? To be something like this?

<url>
<loc>http://localhost:3000</loc>
<xhtml:link rel="alternate" hreflang="en" href="http://localhost:3000/en" />
<xhtml:link rel="alternate" hreflang="zh-Hant" href="http://localhost:3000/zh-Hant" />
</url>
<url>
<loc>http://localhost:3000/contact/</loc>
<xhtml:link rel="alternate" hreflang="en" href="http://localhost:3000/en/contact/" />
<xhtml:link rel="alternate" hreflang="zh-Hant" href="http://localhost:3000/zh-Hant/contact/" />
</url>

Which method is more SEO friendly??? Thanks.