Tough Choice: Wizard vs Sorcerer <3.5>

[Psyren]

In a very general sense, Wizards are better due to earlier spell access and unlimited spells known. (Also, Int is a better casting stat than Cha.)

But there's a lot of other factors to consider: how easily the wizard can get new spells in your DM's campaign, whether spellbook-screw is a possibility, what sources/PrCs are available etc.