If all you had were low level characters then it may not matter much who you assign, but each job specifies the stats that impact the results of that job. A better qualified lab assistant will result in cheaper operations with lower recovery times. A better chef will result in spending less food to feed each person every day.
Orcs and Elves are okay for combat, but I would consider them to be low tier due to the low total stats and lack of a combat racial bonus. Beastkin Wolves are generally considered high tier for physical combat and exploration. Halfkin Wolves are a little below Beastkin, though it is good as the player race. The max stats are determined by the race for everyone except the player and some races are better for some tasks than others, though these differences may not matter much, especially if you cheat for gold and food.
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