I've used both but generally don't use stash. I think it's more expressive to have a single commit like "wip: some simple description goes here" and then to `git commit --amend` this until we are happy with its contents.

As well as being more descriptive if you come back after a long weekend, this also means that you can swap branches without worrying that your stash relates to a particular branch but doesn't explicitly belong to this.