The next few battles were are at Casino, bigger mountains, mud & intermittently snow so I skipped them as done that & want to get to June when the Allies become far more dangerous due to APCR ammo being available & the 76mm for the Sherman.
MkIV's weak armour package becomes irrelevant at that point as APCR can penetrate armour 10 out to around 1500m (30 Hex's).
Its April now so having a refit as desire more units that have a reasonable chance of surviving a front hit from Infantry AT weapons before heading to the cluttered terrain of Normandy.
Done StuG III's so sticking with the MkIV theme we now have the following armour.
7 - MkIV
2 - Panthers
2 - StuG IV
2 - JPz IV/48
2 - Sturmpanzer
1 - StuG(i)
Direct comparison
All have the same gun, fire control, range finder & speed so main gun accuracy & penetration is identical.
MkIV is one size bigger than the rest so at a disadvantage in gun duels especially 1st & 2nd shot.
StuG III & IV are very similar the IV's weak spot is its top armour which is worse than the rest so more vulnerable to artillery.
Its also the only one with an AAMG just what you need attract the planes to that weak top
(earlier III's had AA)
The StuG III's main drawback is its ammo load especially HE for infantry support however the 2 MG variant shown makes up for that.
I would give the edge to the III & spend the extra point.
JPz IV like the early StuG III's has a short range BMG offset by decent ammo load including HE despite being a Tank Destroyer.
Gets 2 Smoke Discharger shots though because of that role, they might be needed due to the worst armour package of the StuG's.
The extra armour on the superstructure may save it on occasion but is lacking versus infantry AT weapons. No Schurzen fitted & 8 on the front hull rather than 9 means the chance of surviving a Baz or Piat hit drops.
It is however considerably cheaper & has the best crew survivability rating.
Will do next battle in a few days when I get a life back, how people regularly work long hours is beyond me.