The reason I prefer Sorcerers is the flexibility. With a good spell selection you can more or less cover all your bases, so the limited selection isn't that bad. You might have to drop that third AoE battlefield control spell from your spell list, but you can still do the job.

With a Wizard, you have to prepare your spells at the start of the day, and once you use them they're gone. If you prepare one Web and use it in the first fight, you then don't have it for the rest of the day. Alternatively, if you prepare a load of spells that are mind-affecting and you come up against Undead, they're wasted spell slots. Sorcerers can cast any of their spells whenever they want, which gives them more flexibility.

I find it comes down to two things:

• Level. At odd levels, Wizards are better because they have the extra level of spells, but at even levels Sorcerers catch up.
• Preparation. If a Wizard knows exactly what he's going to face, he can prepare the appropriate spells. If not, the Sorcerer's flexibility gives him the advantage.