Pilosocereus

This was one of the first cactus plants I bought about a year ago. I originally bought it to add some height to a cactus bowl I was putting together. That bowl was the first and last time I tried to put different plants together. La hates the fact that I don't put plants together, but there is just something in my inner fiber that can't do that. Anyhow - this went into it's own pot and has been there ever since. It is hard to tell, but I don't think it has even grown much, if at all. I'll dig out a picture from a year ago when I get home and update this post, just to make the comparison. As far as what species it is, I'm torn between Pilosocereus azureus, or Pilosocereus pachyclaudus.