One never knows who their sheliach will be. Everyone has the choice to do what they feel is right for them. Those that are professionals would not be in business if they were not successful and did not have a good track record. So if you choose to go to a professional make sure you do the research necessary to know that they are a good fit for you and their clients are compatible with the type of match you are looking for.
Of course, you should always listen to whatever shidduch comes your way no matter who brings it to you because you never know who Hashem will choose as your sheliach.