relevant racial skills:
wings of the crow (temp. stat boost) -> more doubleattack -> more dmg (its description says "Zauberer" which is the Priden sorcerer i think)
astral aegis (shield) -> more defense -> survivability (its description says "Spezialist" which is the xadaganian sorcerer i think)
"a picture says more than 1000 words"
i am not 100% sure about the races as names have been changed a few times + i dont know the exact english terms so someone might confirm the info above
in the end you will someday get the "book of secrets" item which grants all racial skills anyway, so i recommend you do not purely base your decision on these skills