which matters more; Mail piece or consistency?

[Fitzgerald Hall]

Hello everyone,

I am in the midst of direct mail marketing journey and I would like some feedback from experienced marketers. From your experience, which would you say plays a bigger role in attracting leads; mail piece or consistency? I understand consistency is the butter that keeps the bread together but how important is it to send out multiple pieces of mail. The reason I am asking is because I am a simple person and would like nothing more than to send only postcards and receive leads vs mixing up my marketing piece which could complicate things. 

But on another note, I do not want to miss out on valuable leads because I chose not to mix up my marketing piece. I am targeting tax delinquencies if this helps. 

@Michael Quarles