Is it better to hire just one company that does hair and makeup both?
Yes, first of all it saves you money. You get a much better deal hiring just one vendor instead
of two. You deal with less people, that makes it less stressful for you. On your trial run you will see your whole look, not just hair or just makeup. There won't be miscommunication between stylists, which leads to no problems with timing and quality of work on your wedding day.