Offer for exterior masonry/thermal insulation

I have now received an offer from another BU:

Instead of 17.5cm aerated concrete, this one uses a porous clay brick with the same 17.5cm – otherwise, the wall construction is the same. It comes standard with underfloor heating, triple glazing (ug=0.7), and a thermal solar system installed. KFW70 is guaranteed – without any additional payment! Strip foundations are poured up to 20cm above terrain and 10cm of gravel or sand is laid under the base plate. Is this usual and sensible?

In the first offer, the underfloor heating costs almost 7,500€ extra, and KFW70 including solar almost 8,000€ more. Here, the foundation only has a 5cm clean layer of lean concrete. The two BUs don’t differ much in the offered final price; the first offer includes more sockets and higher/more expensive tiles, but only double glazing Ug=1.1 there.

What do you think of the two offers?

Phew... you can't say anything so general... you would have to read the complete construction service description... I would recommend you go to someone who knows about it...

However, nowadays charging extra money for a [FB] is almost a cheek...

How big is the price and quality difference between Poroton and Porenbeton?

There are already huge differences... both in price and quality... you also don't mention which Poroton bricks they install, it's actually just the company name... but they have many different products in their range

I don't know what type of Poroton brick Helma uses, the seller couldn't/wouldn't tell me either.

With a 17.5 cm brick with insulation and facing, does aerated concrete even make sense?
Is there enough soundproofing at all? What does it look like inside the rooms?

I'm really totally unsure which material I should prefer.

The fact is, unfortunately, I have to build with facing...

One could say that with Poroton, aerated concrete, and KS (175 mm), the price comes out roughly the same.