Which material is suitable for the garden fence of the first house?

I find gabions beautiful.

Irony sometimes doesn't come across so well in text form

Nice L-blocks.

Of course, it always depends on the design.
I think it’s a good option. Everyone has different tastes.
Even combined with wooden elements, in my opinion, it makes a clean impression.

So these massive walls I personally find... only missing the cameras on top and the barbed wire.

So these massive walls I personally find... only cameras on top and barbed wire are missing.

However, in my opinion, this impression (cameras, barbed wire, etc.) also depends on the height of the wall/fence. Built at 1m height, I don't really find it bad. When you see them live, they really look classy. In addition, for example, the wooden elements can also be made spaced apart, so that it is not completely closed. Depending on what you want (privacy screen or open).

Gabions, 1.10m tall, 2.10m Berlin Wall.

I would not orient myself towards the neighbors but rather towards what I like.