A good agent is going to ask you to define what you mean by "best or good neighborhood". Fair housing laws require real estate agents to be very careful in how they answer a question such as this. What are you looking for in a neighborhood? What is "good" to you? Are you considering Baltimore city or just the county? People often make decisions about where they buy a home based on proximity to work, social aspects such as local restaurants or commerce, school districts, access to highways, price and crime rate, to name but a very few.
Let me know if I can be of any help!