Search Best Practice

for preforming a search with multiple words from a single field, is it best to:
/wp-json/swp_api/search?s=testing+blah+awesome
or
/wp-json/swp_api/search?s=testing20%blah20%awesome

I’ve looked through the examples, but its all singular phrases.

Thank you.

https://wordpress.org/plugins/searchwp-api/