Stijn, get the automatic. Not all Tags will have the display back, but it is cool to look at. Also, if you decide to sell, the auto will hold its value better and is more desirable. One of the reasons watch people do not like quartz movements is because they are so cheap to make, it is ridiculous. Tag uses a Ronda quartz movement, so you can Google the cost.
I think Tag still uses ETA, or a Sellita automatic movements, so you can Google that, too.