This is really regional. In some countries most people use the second knot, in others most don't. E.g. I've rarely seen it used in the US, but it's standard practice in much of europe.

Whichever you do, if you do it different to the majority view for the region you can often end up with some heavily-opinionated person coming up and telling you that you're doing it wrong so I mostly switch depending on where I am. It's easier than trying to explain that [whichever way] is fine and common practice elsewhere.