Be specific with music likes and dislikes. Be sure names for introductions are pronounced properly. Include any special events or activities. Best Value Cheap is never good, but most expensive may not be your best value. They all lack the experience, music library and equipment necessary to provide you with the quality reception you deserve.
Professional performers are generally more expensive, but have more invested.
They have quality sound and lighting as well as back-up equipment, large music libraries, dependable transportation, and proper attire. They will be willing to spend whatever time is needed with you to properly plan your event. They can handle any situation that may arise. Get references from known wedding service providers. Then ask price and book the best value for your money.