Which is better to use str_slug / urlencode?

Question

Laravel

str_slug - readable, no bugs.
urlencode - better for web crawlers? And here they write they say © and other similar commands can be injected.
Google encode your url.
However, I wonder which is better to use? Why?

Answer 1

https://github.com/laravel/framework/blob/7212b1e9...
it already replaces everything with latin

Answer 2

These are different functions for different purposes.
urlencode is needed for the correct transfer of get parameters, str_slug for SEO downs