Sorc everytime, (well unless it's a low level module and I want to play a sneaky strategic tactical mage as opposed to only being able to scout with the pixie, but ultimately, even if I don't shapeshift and lose spells that way, I grow to hate the annoyance of changing the quickbar for spells all the time, so it's pause all the time to use the radial menu or be a very slow and ineffective caster or redo the quickbar yet again. With the sorc I know which F buttons have which spell lvls and I can fit all the offensive spells into it.)
But sorc struggles for feats, while wizard doesn't, and if you want a spellsword, you need the combat feats, because you do need AB unless the enemies are easy. You would likely want a wide variety of buffs which can tend to wiz again, tho MCing with cleric or pal to get divine might can make decent use of the sorc CHA. AA is a far better choice tho because you dont sacrifice the caster stat for str or dex just so you can hit something. Cleric's divine power (9-10+ lvls) is another way to get a useful BAB and then because you have a high cha you do some serious damage with a cha based sorc. s26-29/cl10-13/m1-4 is one of my favourite characters as is s26-29/aa10-13/(oh lots of choices for the 3rd class *grin*).
In any sort of PvP or online I'd go sorc all the time tho, simply for the quickslot issue and the fact I prefer the RP. Oh and PvP sorc vs mage, the advatage is definitly with the sorc, (which I bet draws some comments *cheeky grin*)
Have fun