Los Angeles is a big city and there are many different types of trademark lawyers that specialize in different areas. There are attorneys that focus on securing and registering trademarks and then there are those that litigate trademark disputes in the court of law.
Depending on what you need, its important to know the differences between a litigator and a transactional lawyer. Its always wise when you get into legal disputes covering Intellectual Property to use a lawyer who understands that area of law as there are unique laws and statues that apply to trademarks.
There are also different types of trademarks that you can register so you want to protect your rights to the further extent of the law and the only way to know what types of class that you want to register in and what type of marks you need registered for full protection are all important. This is why it is always important to talk to a Los Angeles trademark attorney to know your rights.