As in any profession, there are average and there are good Realtors. If you do not have a recommendation from a trusted source, then you are forced to make that decision on your own.
Yes, all REALTORS® have access to the same data, marketing sources, and can show and sell properties listed with any office. Based on this, it may not seem to make a difference who you choose. However, the working relationship can extend several months during the marketing period and a few more once its sold, so you need to be selective to ensure the best possible journey during this time.
An experienced and skilled realtor during your interview will provide information supporting the value of your property; market conditions in your area; input on preparing your home for the market; and a strategy to market your home to the masses of qualified buyers; and any others issues of concern to you. Then, move on to Step 2.