[The Hierophant]

Take both!
In my current game I have both a pure wizard and and a pure sorceress. The sorceress is essentially the party's missile silo, launching offensive spell after offensive spell, whereas the wizard learns the intricate, delecately-pinpointed spells specific to various situations. WHat I like about my wizard is that I can chop and change my memorized spells to fit any given encounter (ie, dememorize breath spells in favour of fire spells when fighting against undead, vice versa when fighting living creatures), something that I can't do with the sorceress.

A wizard is more versatile, while a sorcerer packs more punch. They are both incredibly handy to have.