In general I consider 5 brigade units being a bit kinda overkill.
As ger, I mostly use 3 brigade divisons until almost all leaders are assigned. Sure, I have less firepower per division, but I have a lot of flexibility along the front lines.
There are some exceptions where I use more brigades: airborne units, marine divisions, low softness CA divisions and garrisons.
But I even use 2 brigade divisions: I tend to have MOT-TD as mobile reserves and AC-AC divs as partisan hunters.
As ger, I mostly use 3 brigade divisons until almost all leaders are assigned. Sure, I have less firepower per division, but I have a lot of flexibility along the front lines.
There are some exceptions where I use more brigades: airborne units, marine divisions, low softness CA divisions and garrisons.
But I even use 2 brigade divisions: I tend to have MOT-TD as mobile reserves and AC-AC divs as partisan hunters.