Shades of Green
Explorer
The main advantage of the wizard is versatility on the long run - that is, if he knwos in advance what he'll be up against, chances are he'll find a useful spell for that battle/situation in his spellbook.
Sorcerers are much more limited-use, but within their limited field they are quite powerful (alot more spells).
In other words, if you're fighting a monster (or even army of monsters) with not too many resistances and no too many special tricks, the sorcerer will do more damage due to more spells; if you're facing a varied collection of foes and a tricky environment as well, you wizard will have a tol for every problem while the sorcerer would be lacking fitting spells to most obstacles.
Sorcerers are much more limited-use, but within their limited field they are quite powerful (alot more spells).
In other words, if you're fighting a monster (or even army of monsters) with not too many resistances and no too many special tricks, the sorcerer will do more damage due to more spells; if you're facing a varied collection of foes and a tricky environment as well, you wizard will have a tol for every problem while the sorcerer would be lacking fitting spells to most obstacles.