Garage height - which floor structure (height issue)?

I completely agree with Wickie. This is a garage, not a living room, so a bit of dirt (or discoloration) on the concrete floor doesn't bother me. And yes, with sealed garage floors, puddles will form in winter when you park a snow-covered car inside. I've personally seen that enough in tiled garages as well. I wouldn't want it like that myself. But as always: a matter of taste! And that's the great thing about ownership. Everyone can do it the way they like best.

I assume this is a joke

For the everyday car probably completely unproblematic, since it stands a little differently every day. But I wouldn't want to leave the summer car parked crooked for months.