As an expert plumber, I can advise that when looking for a company to perform a copper repipe and also handle the drywall repair, it's important to find a reputable and experienced plumbing company that has a track record of quality work. You can start by researching online reviews and ratings for plumbing companies in your area, and ask for referrals from friends and family. It's also a good idea to ask potential companies if they have experience with drywall repair, and to see examples of their previous work. Additionally, be sure to ask for a detailed estimate that includes all costs associated with the repipe and drywall repair, so that you can make an informed decision.