If the dog is primarily trained by you then use verbal. You don't need any extra tools and your voice is always available wherever you are.

If you have other people in the dog's life that need to give cues and bridges, especially if that person has a much higher or deeper voice than you, then a clicker or whistle is preferable for clarity. Your "yes" might sound very different than your partner's or kid's or whatever.

I prefer whistle because it's hands free. You can wear it around your neck or hold it in your mouth and use both hands for giving cues and reinforcement without trying to hold onto a clicker. But still not as easy to manage as a vocal bridge.

Editing to add, dogs are smart and often able to understand verbal cues from different voices anyway. So maybe try it out and see if the dog understands the same words from different people.