Vet 0 and Vet 1 (no defensive bonuses)
Grens: 4x80/0.91 = 351.65 ehp
Rifles: 5x80/0.97 = 412.37 ehp
Rifles have 17.26% more ehp
Rifles Vet 2 (-23% RA): 5x80/(0.97/1.23) = 507.22 ehp
Grens Vet 2: same as vet 1, since there's no defensive bonuses = 351.65 ehp
Rifles have 44.2% more ehp
Rifles Vet 3 (-23% and -15% RA): 5x80/((0.97/1.23)/1.15) = 583.3 ehp
Grens vet 3 (-20% DR): 4x80/0.91x1.2 = 421.98 ehp
Rifles have 38.23% more ehp
I meant model vs model, not squad vs squad.