Dunno if this is the right section, but I feel it fits here more than the general gameplay.
What I have found, when comparing ddo to d&d, was that while sorc in d&d offers a more flexible caster in d&d, in ddo it's the other way around. Anyone else got this feeling?
In ddo, both classes are limited primarily by their SP pool. Sorc has 4 spells per spell level memorized, wizard 5, so not that much difference there. However, both can cast any spell in their spell pool, as long as they have the SP.
In d&d however, wizard had to memorize spells he wanted to cast the next day, which meant that as long as the sorcerer knew mostly useful spells, they were a lot more flexible.
Example: Your party stumbles into a bunch of skellies. For dealing with skeletons, the wizard has memorized a couple fireballs(universal damage spell), and a haste (buff the party). He also has some other things memorized, which might, or might not help him later, but these are the spells he has which help with killing said skeletons. He might also choose to memorize 3 fireballs instead, or just 3 hastes and wait for the party to dispose of said baddies.
The sorcerer, however, as long as he has both these spells in his repertoire (mine always will, as long as he has the levels for it), can choose whichever combination is better in his current situation. He can on the spot choose to just dump 3 fireballs through the door, or drop a haste instead. This is invaluable flexibility that wizards just don't posses in pnp, especially since you generally don't know the campaign you're playing, and thus can't prepare spells beforehand exactly how you'll want to use them.
In DDO, this flexibility advantage is lost however, since both classes can cast any spell from their spell pool, and further gimped by the fact that you only get 4 known spells per level, and that metamagic feats, while in pnp were freely chosen by only the sorc, are now also freely chosen by the wizard.
On the other hand, the sorcerer here still sports a much greater spell point pool, much like in pnp, and as an added boost, can spam spells faster.
Also as a disclaimer, I'm still on my first playthrough of ddo (my highest char is level 14), and thus don't know the quests very well, or at all. I made both a wizard, and a sorc, and found out that while sorc is a bit easier to play here due to larger spell pool, it doesn't really offer anything over the wizard so far. And, after I get to know the quests better, wizard can run through just as easy as the sorc, thanks to free spell swapping at shrines.