To SD or not to SD? That is the question, only you could answer

Then my commute to work was mostly in underground subway - that used to be an issue - so I got galaxy s4 few years ago.
It depends how you intend to use. For apps - 16gb is plenty. But if you want to copy lots of music/movies - if you'll quickly run out of space.
Is that $340 for new device or refub?