Exterior masonry made of which material?

To avoid opening the umpteenth thread, I'll just join in here. With our provider, we have the choice between:

[*]20cm sand-lime brick with 16cm EPS insulation (Styrofoam? Mineral wool also possible for an extra charge)
[*]36.5cm aerated concrete
[*]36.5cm Ytong (isn't that also aerated concrete??)
[*]36.5cm EDER brick (XP9)

Personally, I prefer a monolithic construction method because it's easier to tack things onto the house wall (lighting, motion detectors, awnings, carport, ...) and because many people here in the forum don't think much of ETICS. On our current ETICS facade, a woodpecker actually came by once. And isn't it also easier to add insulation to a stone later on if necessary than to an already existing insulation? Or does that not matter?

However, the provider recommended sand-lime brick + EPS because the sound insulation is better, aerated concrete would crumble, and special anchors would be needed for bricks if you want to attach something, which also tend to crack. I rather think economic considerations played a role here and sand-lime brick + EPS is simply cheaper for the provider.
In terms of properties, I liked perlite-filled Poroton brick, but that's in a completely different price range and it's doubtful whether the provider would even agree to a completely different system.

The provider's arguments are correct, even if it would also be economically best for him.

Lighting and motion detectors can be easily mounted with WDVS dowels (BTDT). Awnings are typically anchored in the concrete intermediate ceiling (if available), otherwise in the masonry. In that case, sand-lime brick outperforms the other mentioned alternatives (although there are solutions for those as well).

If you prefer monolithic, then you should also build monolithically.

First of all, is the high sound insulation necessary? Location of the house, a lot of traffic in front of the door? Otherwise, I don’t care at all.
Rumor has it: I had asked our BU about savings and whether it is possible to use Porit aerated concrete instead of Ytong, for example, since they are cheaper. He refused. The statement was: Porit is cheaper, true. It is supposed to be equivalent to Ytong. In practice, Ytong is straighter, less crumbly, the stones arrive at the construction site in better condition. Porit causes more trouble for the bricklayers. That’s why Ytong. Karsten

Thank you for the quick and informative answers.

If you prefer monolithic, then you should also build monolithic.

It's more of a feeling thing and because I've read a lot in the forum here where ETICS is regularly criticized. Personally, apart from the fastening issue, I'm actually relatively unbiased...

First of all, is the high sound insulation necessary? Location of the house, a lot of traffic in front of the door? Otherwise, I wouldn't care at all.

Yes, it shouldn't be neglected. It is located on a larger street where, according to the official noise map, about 60-65 dB occurs (that is where the house is supposed to be built; it's louder at the street).

The provider recommended Kalksandstein+EPS to us because the sound insulation is better.

Full agreement! And another advantage: you get a lot of mass into the house. This is better in both summer and winter. In summer, the stone can absorb a lot of heat. It takes much longer before it becomes unbearably warm inside the house (at outside temperatures >30°C).

It's more of a feeling thing and because I've read a lot in the forum here where ETICS is regularly torn apart.

This is because the ETICS detractors are very loud and usually repeat old prejudices without practical experience. There are not that many ETICS owners who speak negatively about it. Why do you think that is?

And another advantage: You get a lot of mass into the house. This is better in both summer and winter. In summer, the stone can absorb a lot of heat. It takes significantly longer for the house to become unbearably warm (at outdoor temperatures >30°C).

Oh, okay. That was actually another advantage in my eyes for the monolithic construction method, since according to the U-value calculator the phase shift there is significantly longer (EDER brick: 24h vs KS+EPS: 10h). Or am I interpreting that incorrectly?

There aren’t many ETICS owners who speak negatively about it. Why do you think that is?

Not many admit to such a serious bad decision, see the fox and the grapes ;-D