Walking or Crawling first?

First we thought Sam would crawl first because he is rolling and scooting and dragging himself all around our living room. He is bound to crawl next right? Well......
This was his latest trick. He loves to stand up nice and tall and we hold on to his hands to steady him. Yesterday he decided to let go of our hands and just balance. He would do this for a few seconds before needed some balance again.
This is why we think maybe walking first. He is close to moving which ever way he chooses.