Window question - offer

The following question about windows:
Our house has the following plastic windows planned:

KG:
4x basement windows

EG:
2x living room/dining room (floor-to-ceiling, tilt & turn + fixed glazing - 2.8m wide of which 1.4m is fixed glazing)
1x kitchen window (1.6m wide)
1x guest WC
1x hallway window (floor-to-ceiling)

OG:
2x bedrooms (tilt & turn + door, floor-to-ceiling)
2x children's room floor-to-ceiling
1x children's room ("normal window")
1x bathroom window

We have an offer for €14,000 and one for €10,000.
With the more expensive offer, we have the impression that the windows are of higher quality.
Uw values are comparable in both offers (triple glazing).
We are unsure what is realistic here.

Questions about window technology:
Do we need RC2 security class windows on the EG?
Should all windows on the EG be lockable?
How many mushroom cams should a tilt & turn window have (also with post)?
How many mushroom cams should a pure turn window (with mullion) have?

Is there any other tip you can give us or what else should we pay attention to?
Thanks in advance!

Regards
xdiver

What makes the expensive windows higher quality? The correct installation is particularly important; for normally sized windows, the "window brand" is probably unimportant. Is RC2 enough? No idea, but it is at least better than basic protection. A few weeks ago, there was a report on television showing that the difference between RC1 and RC2 is quite small but possibly already sufficient. If the window cannot be pried open immediately, the burglar might just go away again. Lockable from the inside is just a gimmick but helps prevent small children from opening the windows from the inside. If the shutters are down at night (also during vacation, for example, through timers) or you close the windows when leaving the house, that is already worth a lot.

Burglar-resistant but only if not only the handle is locked - because that only prevents operation from the inside and does absolutely not stop the burglar from prying open the window. If so, then you need a locking cylinder or pin-tumbler cylinder or similar - but that costs money again (up to 70 EUR per window). The police, by the way, offer good advice on this topic for free! They also come to your home for consultation (at least in our area).

Resistance to break-ins but only if not just the handle is locked - because that only prevents operation from the inside and does not hinder the burglar at all when prying open the window. If anything, you need a locking cylinder or pin-tumbler cylinder or similar - but that costs money again (up to 70 EUR per window). By the way, the police offer good advice on this topic free of charge! They also come to your home for consultation (at least where we are).

nordanney: some pry, others have OTHER methods, for which the lockable olive makes sense. Everyone in the burglary business has their preferences for getting in... they also don’t deviate quickly if the house is planned as a "random target" (common). I myself come "from the criminal investigation department" and know my way around this fairly well (at least when it comes to trace evidence).

nordanney: some use leverage, others have DIFFERENT methods, which is where the lockable olive makes sense. Everyone in the burglary trade has their preferences for getting in... they don't deviate from that easily when the house is planned as a "random target" (common).
I myself come "from the criminal investigation department" and know my way around reasonably well (at least when it comes to trace patterns)

I believe you that much.
However, I don't want the OP to sit back relaxed with "simple" lockable olives and think that everything is fine with that.
The overall package has to be right.

I believe you on that. But I don't want the OP to relax with "simple" lockable olives and think that everything is fine with that. The overall package has to be right.

You're right! I was only referring to your statement about the "gag." Burglary protection starts in the garden and neighborhood and ends with the interior lighting. In between are windows. There is no 100% security... you can spend thousands, but also just a "few" euros. But as you say: the police offer preventive consultations – free of charge, of course! Everything else depends on the available budget and other factors*

We have lockable olives, shutters, and mushroom head locks. *Additionally, "moving" lights inside and outside and some "disorder" during absences, which suggest life in the house. A hedge is planned that is not opaque during the dark season. But I think the OP didn’t want to know that?!