It's not the company that makes the realtor but the realtor who makes the realtor. And find out how long he has worked in the area. Find out what houses he has sold and find out whether it was a fair price. A knowledge of what the sales are and what listings are available. You don't want a realtor with high pretense and his or her nose in the air.
Nobody wants that any more.
The old days of the realtor with the Mercedes and the gold jewelry dripping off is old school because you could be showing a guy around who has made his money on the Internet, wearing jeans and a T-shirt, who could buy and sell the company. Most of all an ability to do what is required for a specific client. Clients are not all the same. They're listening to you and trying to accommodate what you're requesting, trying to explain to you what's possible in the market and within your budget. The buyer should be told what work is required and whether the home will suit his needs in the long term, for example if the family will need more than one bathroom in the future.