New construction roller shutter box made of plastic or EPS

Hello dear forum,

we are currently faced with the agony of choice when it comes to windows.

Which system for the roller shutter box have you decided on and why?

Since we definitely want the revision on the inside, exterior roller shutters are already out for us.

So far, we have been offered attachment systems made of plastic with insulation in the box, which are said to be good and inexpensive compared to built-in roller shutters directly in the masonry or attachment systems completely made of EPS 35.

Data from a manufacturer, as an example
Attachment system made of plastic with insulation in the box U(sb) value: 0.8
Attachment system made of plastic with insulation in the box f(RSi) value: 0.74
Attachment system made of plastic with insulation in the box sound insulation value Rw: 31db

Attachment system made of EPS 35 U(sb) value: 0.77
Attachment system made of EPS 35 f(RSi) value: 0.79
Attachment system made of EPS 35 sound insulation value Rw: 47 db

Based only on the U-value, the improvement seems absolutely negligible to me, right?