Contrary to popular belief, the firearm tactics pioneered by Maurice of Orange and Gustavus II Adolphus were not as effective as the conservative Tercios employed by the Catholic powers.
Adolphus infantry is better than reformed tercio, as reformed tercio is crap.
Contrary to popular beliefs, best armies were those who fighted hand to hand like free shooters, charge infantry and highlanders infantry.
EDIT: Some calculations i made. If you see any mistakes tell me, but i think there isn't.
Fire Damage dealt by Gustavian Infantry to Highlander infantry
0 + 5 - 4 => 1 * 6 = 6
1 + 5 - 4 => (2 - 1) = 6
2 + 5 - 4 => (3 - 1) = 12
3 + 5 - 4 => (4 - 1) = 18
4 + 5 - 4 => (5 - 1) = 24
5 + 5 - 4 => (6 - 1) = 30
6 + 5 - 4 => (7 - 1) = 36
7 + 5 - 4 => (8 - 1) = 42
8 + 5 - 4 => (9 - 1) = 48
9 + 5 - 4 => (10 - 1) = 54
Ratio = 26,4
Fire Damage Dealy by Highlander Infantry to Gustavian infantry
0 + 3 - 4 => 2^-1 * 6 = 6
1 + 3 - 4 => 1 * 6 = 6
2 + 3 - 4 => (2 - 1) * 6 = 6
3 + 3 - 4 => (3 - 1) * 6 = 12
4 + 3 - 4 => (4 - 1) * 6 = 18
5 + 3 - 4 => (5 - 1) * 6 = 24
6 + 3 - 4 => (6 - 1) * 6 = 30
7 + 3 - 4 => (7 - 1) * 6 = 36
8 + 3 - 4 => (8 - 1) * 6 = 42
9 + 3 - 4 => (9 - 1) * 6 = 48
Ratio = 22,8
Shock damage dealt by Gustavian Infantry to Highlander infantry
0 + 4 - 3 => 1 * 6 = 6
1 + 4 - 3 => (2 - 1) * 6 = 6
2 + 4 - 3 => (3 - 1) * 6 = 12
3 + 4 - 3 => (4 - 1) * 6 = 18
4 + 4 - 3 => (5 - 1) * 6 = 24
5 + 4 - 3 => (6 - 1) * 6 = 30
6 + 4 - 3 => (7 - 1) * 6 = 36
7 + 4 - 3 => (8 - 1) * 6 = 42
8 + 4 - 3 => (9 - 1) * 6 = 48
9 + 4 - 3 => (10 - 1) * 6 = 54
Ratio = 26,4
Shock damage dealt by Highlander Infantry to Gustavian Infantry
0 + 6 - 3 => (3 - 1) * 6 = 12
1 + 6 - 3 => (4 - 1) * 6 = 18
2 + 6 - 3 => (5 - 1) * 6 = 24
3 + 6 - 3 => (6 - 1) * 6 = 30
4 + 6 - 3 => (7 - 1) * 6 = 36
5 + 6 - 3 => (8 - 1) * 6 = 42
6 + 6 - 3 => (9 - 1) * 6 = 48
7 + 6 - 3 => (10 - 1) * 6 = 54
8 + 6 - 3 => (11 - 1) * 6 = 60
9 + 6 - 3 => (12 - 1) * 6 = 66
Ratio = 39
Count that we got 3 phases of fire before shock so max casualities :
Highlanders max casualities = 162
Gustavian max casualities = 144
This is like ~15% less damage max.
Minimum causalities for both = 18 (like ~2 % less damage)
Ratio damage :
Highlanders ratio damage for 3 phases = 79,2 (~8% less damage but it is only ratio)
Gustavian ratio damage for 3 phases = 68,4 (~7% less damage but it is only ratio)
So in the shock damage ratio is from :
Damage to gustavian = ~98,28 to ~114,66
Damage to Highlanders = ~67,08 to ~77,616
Max damage is :
Damage to gustavian = ~166,32 to ~194,04
Damage to highlanders = ~139,32 to ~158,76
Min damage is :
Damage to gustavian = ~30,24 to ~35,28
Damage to highlanders = ~15,48 to ~17,64
And now i am confused XD
But best to talk about ratio. If we add it up together :
Damage ratio (dealt in 6 days to gustavian) = 166,68 to 183,06
Damage ratio (dealt in 6 days to highlanders) = 146,28 to 156,816
As we see, gustavian clearly acquires more damage if we count up ratio so i say, why not take highlanders?