Some numbers. Not particularly rigorous, but W and L are on awkward places on the keyboard to keep hitting to make the little rooms. Probably should just edit the arena layout, but whatever. Obviously, certain factors (Weapon material, room size, lack of armor, and species choice being primus) are going to influence things above and beyond the skills, so take it as you will.
And draw your own conjectures, 'cause while fighter doesn't seem to be making a terribly large difference in most cases, I can't really tell folks what's causing it when the skill does matter. Someone else can go in and do 50 sets of 10 1v1 matches, carefully noting down cause of death and primary organ/bone damage causes, heh.
A set of 7 1v1 amphibian men matches, both sides being GM in the same skill, and one side being GM fighter in addition. Battle occurs in a single 1x2 room created by lava cooling. All weapons Iron. Victor results:
Key: F = Fighter, NF = Not Fighter
Wrestling: 5F vs 2NF
Axes (Battle Axe): 2F vs 5NF
Swords (Long Sword): 1F vs 6NF
Knives (Large Dagger): 1F vs 6NF
Maces (Mace): 4F vs 3NF
Hammers (War Hammer): 3F vs 4NF
Spears (Spear):4F vs 3NF
Pikes (Pike):5F vs 3NF
Lasher (Scourge): 4F vs 3NF
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Just for fun, a single 10v10 battle each, same skill setup, with victor and survivor numbers noted.
Wrestling: Whoops. 7F
Axes (Battle Axe): 4NF
Swords (Long Sword): 5NF
Knives (Large Dagger): 4F
Maces (Mace): 3F
Hammers (War Hammer): 10NF {+FLAWLESS VICTORY+}
Spears (Spear): 2NF
Pikes (Pike): 5F
Lasher (Scourge): 6NF
==
Incidentally, in a forgetful moment, I had one set of GM knives go in wielding long swords; in that case, the winner was the fighters with 9 survivors. Hmm.
As a final note, let it be known that three hundred and forty six amphibian men of varying genders died to produce these numbers. Let us laugh at their passing.