Anything Free is always better than anything for which we have to pay.
But having said that, you have to see if the free thing is of any use at all or not.
So before answering the question you have to see the result.
If you are getting response by free advertising,there is no need for paid but if you are not getting adequate response from free ad ,please go for paid one instead of wasting your time which is also not less costly then your money.