Monte Cook recognised in his Alt.Sorcerer that giving identical spell lists to Sorcerers and Wizards can cause problems. A spell can be more valuable to a spontaneous caster, and thus more useful, than to a caster who must prepare spells in advance.
Take, for example, the infamous
shield spell. It's a mainstay of young spellcasters, and it remains useful throughout their lives. However, as a spell it is
more valuable to the Sorcerer than to the Wizard. The Wizard has only so many spells available to him that he can prepare daily, and he must decide in advance how many slots it is worth devoting to
shield spells, how many to other defensive, offensive and utility magics. The likelihood is that the Wizard may prepare
shield once, maybe twice. It's easy to use them up, and be bereft of that protection when you need it. On the other hand, the Sorcerer who knows
shield can decide at any time that the spell is the best use for a given spell slot and cast it. He can obtain a powerful defensive spell at will, potentially as many times each day as he has spell slots available. So
shield is more valuable to the Sorcerer - he can get more mileage out of this spell than can the Wizard. Monte recognised this by making
shield a second level spell for his Sorcerers. He did similar things with the
polymorph and
haste spells, and with the same reasoning.
The other big flavour change for Monte's Sorcerer is the variant Eschew Material Components feat. They don't use material components, and if they would be expensive components they pay Experience Points instead. This does a good job of modelling someone who is an innate wielder of magic, and not simply a variant form of the Wizard.
Other changes seem to reflect Monte's design philosophy: more skill points, more hitpoints, a wider skill list, and better armour/weapon choices. Some of these arise from the reasoning behind the character (he doesn't study so he has more time to spnd being physical and studying the outside world). The changes to which spell are on the Sorcerer spell list is also a reflection of an idea of a Sorcerer - someone who is physical and immediate, not studious and meticulous.
All told, I far prefer the Monte Cook Sorcerer. It has the advantage of a real coherent design strategy making it easier to model a character on the framework. I have adopted it for my
Shattered World campaign, and it's working out just fine.
I'll leave to others whether it disadvantages Wizards.
