Human: Str 16, Dex 16, +1 feat
H-Orc: Str 18, Dex 16
Halfling Str 14, Dex 18
Assuming straight up fighters. All armed with spiked chains that you can apply weapon finesse to. Assume level 3 fighters for each, again for equaling out misc. factors.
Human Feats (5)
Ex Wpn Spk Chain, Power Attack, Cleave, Great Cleave, Imp Trip
H-Orc Feats (4)
Ex Wpn Spk Chain, Power Attack, Cleave, Great Cleave
Halfling Feats (4)
Ex Wpn Spk Chain, Weapon Finesse, Power Attack, Improved Finesse
Damage ratings:
Human = 2d4 + str (3) * 1.5 = 2d4 + 4 w/ +6 to hit.
PA Human = 2d4 + str(3) *1.5 + 3 = 2d4 + 7 w/ +3 to hit
H-Orc = 2d4 + str(4) *1.5 = 2d4 + 6 w/ +7 to hit
PA H-Orc = 2d4 + str(4)*1.5 + 3 = 2d4 + 9 w/ +4 to hit
Halfling (small wpn) = 1d6 + str(2)*1.5 + dex(4) = 1d6 + 6 w/ +7 to hit
PA Halfling = 1d6 + str(2)*1.5 + dex(4) + 3 = 1d6 + 9 w/ +4 to hit.
Funny thing isn't it? The halfling can actually match the h-orc for damage, excepting only weapon size, if he takes the correct feats...
H-Orc