I did a study on that once. Created 3 identical samurais, only different in 2 categories each. One got senses and dexterity boosted each promotion, one got dexterity and speed, one got senses and speed. Or something like that. Equal equipment too, katana and wak only. Equal armor and load.I would also balance out skills - sword, dual weapons, critical strike, close combat etc at each level-up. I wanted the only difference to be the two major categories.
I stopped the test around level 10. One of the samurais was getting more lightning strikes and one was getting more criticals but I forget which was which.
I'm having a lot of fun with a solo faerie ninja-turned-bishop that's weilding a Staff of Doom right now. I've put only intelligence and speed to maximum and then dexterity and senses and am at level 20 (6 nin, 14 bis) and I get lots of critical kills now even though critical hits is on hold at 65 until I go back to ninja later on. I get 2 attacks with 2 swings as long as I'm not overloaded and +15 to hit with Superman and Enchanted Blade running. I'm a lot of bada$$ in a little package!I use RFS-81 to kill Brekek. I go get him just for the job, usually he levels-up once, then go get the stone idol. He goes alone back to Crocks, gets the speech and then off to kill the frog. Every time he gets a critical kill on that frog and comes back with some fine eatin'! Then I dismiss him right there and then attack him so Crock will join in and get out from behind the counter. After RFS-81 is smashed I go rob Crocks chest and sell the stuff back to him. Revenge for the kidnapper. Don't mention the game's blackmailer. She's stacked so I gave her a pass.