The vocals are the hardest thing to mix since they are so important. The entire song is built around them! One of the most difficult things to get right is the vocal space.
Let’s learn how to determine which is best for your song – reverb or delay. Reverb is the sound of the room. When reverberation is added to an instrument, that instrument sounds like it’s in a new space. Delay, on the other hand, is much more precise. It’s just one repetition after another of the notes of an instrument.
Read more about this here: https://www.musicianonamission.com/vocal-reverb-and-vocal-delay/