Which entrance door for the garage?

We also have the Hörmann standard steel sheet door on the side. The door is no designer piece, truly just functional.

How thick is this steel door, can you roughly say?
For us, it will be on the side, about 7 meters from the front of the garage.
The insulated Hörmann door is of course much more expensive, it should cost about 400 euros more for us.

Regards
Sabine

: Steel sheet. The same material as the swing gate. Maybe 2mm?