For a more thorough clarification of why the two formats search the exact same, see JavaLatte's answer and note that "the best" is actually a enhance The sentence finishes with a string of "wh-" noun clauses. These clauses aren't concerns, so the final a single should also not be a https://www.ocloudi.com/how-the-best-hosting-providers-provide-reliable-performance-for-e-commerce-websites/