I understand your situation, it could be frustrating search however please talk more than one agent from your area, ask them their marketing tools, marketing strategy online and offline. You will find the best one from their responses.
I would ask you to carefully consider how you define "successful".
What you want is the Realtor who is best suited to sell your home, right? So you need to find the Realtor that:
1. Understands your needs and can convince you that they are the best suited for the job
2. Is someone with whom you can work, trust, and feel comfortable.
3. Is not afraid of telling you the truth.
My recommendation is to interview three Realtors, compare their proposals, and select the best one. All Realtors are not created equal.