The best company will be the one that offers the services that you need at a fee or interest level that you can afford. In other words, it must be the best for your personal financial situation as well as your own preference. There are more factors to your preference than just the interest rate. It may be that you want a company that is physically near to you to be your lender. This may in many cases be possible. Or, after calling several of the companies and discussing your financial obligations, you may be impressed by customer service at a certain company. You may have already done business with one of the companies, or at least know of someone who has, and this may be a factor in your decision.
After narrowing the field to maybe three companies, investigate further. Call the Better Business Bureau and make sure the company of your choice has no complaints, is certificated and has a qualified staff to serve you. If this all checks out, contact your chosen company and let them go to work for you.
The real point is, no one can actually tell you which debt consolidation company is right for you. There are so many deciding factors, you simply have to decide what you are looking for and make your choice based on what is right for you.
After deciding and putting the company to work, you will have a great deal of stress taken off of you, and will feel better all around.