Broker Brand Versus Real Estate Agent

I saw a really nice TV commercial for Coldwell Banker the other day which seemed to imply that if I use them to sell my home, I would be more successful. They had a “SOLD” sign in all the shots. So I started to wonder, does it really matter which real estate brokers sign is in my yard or is it simply enough to have a great real estate agent market my home no matter which company they are with?