You can do both and increase you odd of finding your soul mate.
Your soul mate might have placed a personal ad and if you don't place one or check you could miss them.
It all depends on what your purpose is.
Are you looking for casual dating or the love of your life?
In general, personal ads are best for casual dating, and matchmaking is best for finding the love of your life.
You can try Free Matchmaking or place a Free Personal Ad and see which you like better.
Should I include my real email address in my profile or ad?
What kind of pictures should I include with my profile?
What hobbies and interests should I list in my profile?
Do I have to answer all the questions on a profile or personal ad form?
Should I include a picture with my profile or a personal ad?