How many chambers a window profile has is not a design goal, but rather results more or less "incidentally" from making the profile torsion-resistant. Therefore, it is nonsensical to "argue" with the number of resulting chambers or, in my opinion, morally unfair to speculate that laypeople transfer their (in any case also incorrect) assumption that "three panes are 'better' than two" to the number of profile chambers. In a way, a window profile is comparable to a floor plan, where, for example, load-bearing walls are often thicker than those recognizable to laypeople and in other cases walls of the same thickness as non-load-bearing ones may suffice due to shorter spans in between. Some window profiles are "slim," optimized for narrow visible surfaces, others trimmed for "clear" edges or, conversely, for "soft" rounded edges. Different construction philosophies and/or different optical design goals are the reasons for a (in the "incidental" result) different number of profile chambers, but not price and/or quality! The "security level" of windows regarding burglary protection is a complex field of various not only parametric measures. Specifically, for example, the now widely used "mushroom head locks" are an easily retrofittable feature. Higher / wider windows are naturally easier to pry open, especially from a half-open position (tilt). More protection makes sense primarily where windows are easily accessible (ground floor, but of course also some windows on the upper floor over a canopy / bay window / garage). Easily accessible and hard to see inside are the burglar’s favorites, and in cases of forced entry he wants to make little noise.