It is an interesting point. In my usage, I don't view it as a one-or-the-other proposition. I use Julia, so if I'm doing some exploratory work and experimentati

It is an interesting point. In my usage, I don't view it as a one-or-the-other proposition. I use Julia, so if I'm doing some exploratory work and experimentation, or making something to present results, then the IJulia notebook is great. If I'm writing some serious longer-running stuff, or a package, I'm in an editor. Sometimes I'll write code in a separate file and call it from a notebook just to keep the notebook focussed on communicating something, and "hiding" the details.