Okay, Orks. Kroozers only have one void shield, so unless you are running the No Salvo rules the extra armor does not make up for the lack of a second void shield.
Against a Kroozer with 23 armour: Dual Sunsears with and without salvoing (S-RAW & S-NS), a mars cannon with a Titanforge lance (L-RAW), with tearing (L-T) or allowing multiple hits (L-MH)
K
S-RAW
S-NS
L-RAW
L-T
L-MH
30
0.35
0.09
0.86
1.00
0.86
40
1.73
0.83
1.52
1.79
2.47
50
3.63
1.68
2.38
2.79
4.28
60
6.06
2.65
3.42
4.02
6.27
70
8.96
3.72
4.66
5.47
9.41
Compare with a Cruiser with two void shields and 20 armour. I didn't have Lance with Tearing vs Cruiser available.
C
S-RAW
S-NS
L-RAW
L-T
L-MH
30
0.18
0.11
0.57
0.57
40
1.07
0.71
1.14
1.52
50
2.46
1.51
1.90
2.85
60
4.34
2.50
2.85
4.56
70
6.71
3.70
3.99
7.60
).