I haven't been keeping track, but Constitutional Monarchies DEFINITELY receive discontent from schools and universities (Red Flag, Desire for Change). Konigsberg is nearly bursting with revolutionary anger. But that being said, my garrisons are all minimal yet, despite having upgraded everything I have to the 3rd tier (below Factories), I have not experienced any serious trouble in any of my settled provinces. Thus far, I have only upgraded metalworking craft centers in my largest provinces (Warsaw, Konigsberg, Vilnus) to Factories. All three have small garrisons - Warsaw has 6 Winged Hussars, 4 6pdr. Gallopers, 1 Light Dragoon, Vilnus has 3 Uhlans, Konigsberg has 2 Light Dragoons. Konigsberg is also Protestant rather than Catholic owing to my focus on converting the heathen Muslims to my south with my limited religious capacity.

I cannot compare with any of the other government types as I've only played extensively as Poland, but I'm experiencing negligable discontent in most of my cities at this point (Poland, 1749, 98% Industrial Research completed). Some, such as Morovia, aren't garrisoned at all.