There are several things that can determine what makes any hair replacement company one of the best, but the reality is that it is no different for hair replacement companies than it is for any company providing a product or service.

Years in service; while more years doesnt necessarily mean better there is something to be said for the experience of the people youre working with. Many companies can be old in years but have a staff that is young and may not have the practical experience needed to answer questions backed up with facts. If you have the opportunity to chat with someone from the company youre looking to do business with, have questions handy to ask that perhaps you know the answers to and see if they can answer your questions clearly and if they cant take note if they refer your question to someone with more experience and dont be afraid to ask the rep their background.

Customer service; how does the company handle a problem? If they go the extra mile to satisfy you and make sure to keep your business why would you want to go anywhere else? If they leave you to your problem, you bought it, its yours, odds are they arent capable or willing to make sure youre satisfied.

Consistent Quality Products; a good company will have a variety of products to offer of the best possible quality available. Be concerned about huge price differences for products that appear to be the same. Sometimes products look alike but the performance is what really matters and you can be spending more than necessary trying the lower priced item then finding you need to spend more to get what you want and youve now paid double.
Do your homework, listen to your gut and get referrals from friends and family if possible.